1251542555944 has 16 divisors (see below), whose sum is σ = 2356889642100. Its totient is φ = 623038651392.

The previous prime is 1251542555927. The next prime is 1251542555983. The reversal of 1251542555944 is 4495552451521.

It can be written as a sum of positive squares in 2 ways, for example, as 1202728956100 + 48813599844 = 1096690^2 + 220938^2 .

It is a super-2 number, since 2×1251542555944² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1251542555891 and 1251542555900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341576377 + ... + 341580040.

Almost surely, 2^{1251542555944} is an apocalyptic number.

It is an amenable number.

1251542555944 is a deficient number, since it is larger than the sum of its proper divisors (1105347086156).

1251542555944 is a wasteful number, since it uses less digits than its factorization.

1251542555944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683156652 (or 683156648 counting only the distinct ones).

The product of its digits is 7200000, while the sum is 52.

The spelling of 1251542555944 in words is "one trillion, two hundred fifty-one billion, five hundred forty-two million, five hundred fifty-five thousand, nine hundred forty-four".