125917255818 has 24 divisors (see below), whose sum is σ = 273442197600. Its totient is φ = 41876806824.

The previous prime is 125917255799. The next prime is 125917255819. The reversal of 125917255818 is 818552719521.

125917255818 is a `hidden beast` number, since 1 + 2 + 5 + 9 + 1 + 72 + 558 + 18 = 666.

It is not an unprimeable number, because it can be changed into a prime (125917255819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7959528 + ... + 7975331.

It is an arithmetic number, because the mean of its divisors is an integer number (11393424900).

Almost surely, 2^125917255818 is an apocalyptic number.

125917255818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

125917255818 is an abundant number, since it is smaller than the sum of its proper divisors (147524941782).

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

125917255818 is a wasteful number, since it uses less digits than its factorization.

125917255818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15935306 (or 15935303 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 54.

The spelling of 125917255818 in words is "one hundred twenty-five billion, nine hundred seventeen million, two hundred fifty-five thousand, eight hundred eighteen".