125806656172 has 6 divisors (see below), whose sum is σ = 220161648308. Its totient is φ = 62903328084.

The previous prime is 125806656149. The next prime is 125806656187. The reversal of 125806656172 is 271656608521.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15725832018 + ... + 15725832025.

Almost surely, 2^125806656172 is an apocalyptic number.

It is an amenable number.

125806656172 is a deficient number, since it is larger than the sum of its proper divisors (94354992136).

125806656172 is a wasteful number, since it uses less digits than its factorization.

125806656172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31451664047 (or 31451664045 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 125806656172 in words is "one hundred twenty-five billion, eight hundred six million, six hundred fifty-six thousand, one hundred seventy-two".