125645633128 has 32 divisors (see below), whose sum is σ = 236997072360. Its totient is φ = 62446567680.

The previous prime is 125645633111. The next prime is 125645633129. The reversal of 125645633128 is 821336546521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49238722404 + 76406910724 = 221898^2 + 276418^2 .

It is not an unprimeable number, because it can be changed into a prime (125645633129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13000618 + ... + 13010278.

Almost surely, 2^125645633128 is an apocalyptic number.

It is an amenable number.

125645633128 is a deficient number, since it is larger than the sum of its proper divisors (111351439232).

125645633128 is a wasteful number, since it uses less digits than its factorization.

125645633128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19237 (or 19233 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The spelling of 125645633128 in words is "one hundred twenty-five billion, six hundred forty-five million, six hundred thirty-three thousand, one hundred twenty-eight".