1553394481920 has 288 divisors, whose sum is σ = 5590041085440. Its totient is φ = 408403537920.

The previous prime is 1553394481901. The next prime is 1553394481921. The reversal of 1553394481920 is 291844933551.

1553394481920 is a `hidden beast` number, since 1 + 5 + 5 + 3 + 3 + 9 + 448 + 192 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1553394481921) 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 31 ways as a sum of consecutive naturals, for example, 2137227 + ... + 2770293.

It is an arithmetic number, because the mean of its divisors is an integer number (19409864880).

Almost surely, 2^{1553394481920} is an apocalyptic number.

1553394481920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553394481920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2795020542720).

1553394481920 is an abundant number, since it is smaller than the sum of its proper divisors (4036646603520).

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

1553394481920 is an equidigital number, since it uses as much as digits as its factorization.

1553394481920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633168 (or 633148 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 1553394481920 in words is "one trillion, five hundred fifty-three billion, three hundred ninety-four million, four hundred eighty-one thousand, nine hundred twenty".