125561565264 has 20 divisors (see below), whose sum is σ = 324367377056. Its totient is φ = 41853855072.

The previous prime is 125561565253. The next prime is 125561565277. The reversal of 125561565264 is 462565165521.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 2615865943 = 125561565264 / (1 + 2 + 5 + 5 + 6 + 1 + 5 + 6 + 5 + 2 + 6 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307932924 + ... + 1307933019.

Almost surely, 2^125561565264 is an apocalyptic number.

It is an amenable number.

125561565264 is an abundant number, since it is smaller than the sum of its proper divisors (198805811792).

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

125561565264 is a wasteful number, since it uses less digits than its factorization.

125561565264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615865954 (or 2615865948 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 48.

The spelling of 125561565264 in words is "one hundred twenty-five billion, five hundred sixty-one million, five hundred sixty-five thousand, two hundred sixty-four".