125151661566 has 12 divisors (see below), whose sum is σ = 271161933432. Its totient is φ = 41717220516.

The previous prime is 125151661559. The next prime is 125151661597. The reversal of 125151661566 is 665166151521.

125151661566 is a `hidden beast` number, since 1 + 2 + 5 + 15 + 16 + 61 + 566 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3476435026 + ... + 3476435061.

It is an arithmetic number, because the mean of its divisors is an integer number (22596827786).

Almost surely, 2^125151661566 is an apocalyptic number.

125151661566 is an abundant number, since it is smaller than the sum of its proper divisors (146010271866).

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

125151661566 is a wasteful number, since it uses less digits than its factorization.

125151661566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6952870095 (or 6952870092 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The spelling of 125151661566 in words is "one hundred twenty-five billion, one hundred fifty-one million, six hundred sixty-one thousand, five hundred sixty-six".