125612156691 has 48 divisors (see below), whose sum is σ = 223836687360. Its totient is φ = 66290051520.

The previous prime is 125612156653. The next prime is 125612156693. The reversal of 125612156691 is 196651216521.

125612156691 is a `hidden beast` number, since 1 + 2 + 5 + 61 + 21 + 566 + 9 + 1 = 666.

It is not a de Polignac number, because 125612156691 - 2⁷ = 125612156563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125612156693) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1452615 + ... + 1536656.

It is an arithmetic number, because the mean of its divisors is an integer number (4663264320).

Almost surely, 2^125612156691 is an apocalyptic number.

125612156691 is a deficient number, since it is larger than the sum of its proper divisors (98224530669).

125612156691 is a wasteful number, since it uses less digits than its factorization.

125612156691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2989336 (or 2989333 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The spelling of 125612156691 in words is "one hundred twenty-five billion, six hundred twelve million, one hundred fifty-six thousand, six hundred ninety-one".