1553871943936 has 135 divisors (see below), whose sum is σ = 3367442478533. Its totient is φ = 715615979520.

The previous prime is 1553871943933. The next prime is 1553871943957. The reversal of 1553871943936 is 6393491783551.

The square root of 1553871943936 is 1246544.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 1504410183936 + 49461760000 = 1226544^2 + 222400^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553871943933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3370654746 + ... + 3370655206.

Almost surely, 2^{1553871943936} is an apocalyptic number.

1553871943936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1553871943936 is the 1246544-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553871943936

1553871943936 is an abundant number, since it is smaller than the sum of its proper divisors (1813570534597).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1553871943936 is an frugal number, since it uses more digits than its factorization.

1553871943936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 476 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 64.

Multiplying 1553871943936 by its sum of digits (64), we get a square (99447804411904 = 9972352²).

1553871943936 divided by its sum of digits (64) gives a square (24279249124 = 155818²).

The spelling of 1553871943936 in words is "one trillion, five hundred fifty-three billion, eight hundred seventy-one million, nine hundred forty-three thousand, nine hundred thirty-six".