1555610112081 has 27 divisors (see below), whose sum is σ = 2274844904059. Its totient is φ = 1024374000192.

The previous prime is 1555610112071. The next prime is 1555610112083. The reversal of 1555610112081 is 1802110165551.

The square root of 1555610112081 is 1247241.

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

1555610112081 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 610 + 11 + 20 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 734121662481 + 821488449600 = 856809^2 + 906360^2 .

It is not a de Polignac number, because 1555610112081 - 2¹³ = 1555610103889 is a prime.

It is a super-2 number, since 2×1555610112081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555610112083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 310560505 + ... + 310565513.

Almost surely, 2^{1555610112081} is an apocalyptic number.

1555610112081 is the 1247241-st square number.

1555610112081 is the 623621-st centered octagonal number.

It is an amenable number.

1555610112081 is a deficient number, since it is larger than the sum of its proper divisors (719234791978).

1555610112081 is an frugal number, since it uses more digits than its factorization.

1555610112081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10190 (or 5095 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 36.

Multiplying 1555610112081 by its sum of digits (36), we get a square (56001964034916 = 7483446²).

The spelling of 1555610112081 in words is "one trillion, five hundred fifty-five billion, six hundred ten million, one hundred twelve thousand, eighty-one".