125407705551 has 32 divisors (see below), whose sum is σ = 177476866560. Its totient is φ = 78608112000.

The previous prime is 125407705547. The next prime is 125407705559. The reversal of 125407705551 is 155507704521.

It is not a de Polignac number, because 125407705551 - 2² = 125407705547 is a prime.

It is a super-2 number, since 2×125407705551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125407705559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 903961 + ... + 1033421.

It is an arithmetic number, because the mean of its divisors is an integer number (5546152080).

Almost surely, 2^125407705551 is an apocalyptic number.

125407705551 is a deficient number, since it is larger than the sum of its proper divisors (52069161009).

125407705551 is a wasteful number, since it uses less digits than its factorization.

125407705551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129727.

The product of its (nonzero) digits is 245000, while the sum is 42.

The spelling of 125407705551 in words is "one hundred twenty-five billion, four hundred seven million, seven hundred five thousand, five hundred fifty-one".