125640655506 has 24 divisors (see below), whose sum is σ = 273096742464. Its totient is φ = 41745553560.

The previous prime is 125640655477. The next prime is 125640655519. The reversal of 125640655506 is 605556046521.

125640655506 is a `hidden beast` number, since 1 + 2 + 56 + 40 + 6 + 5 + 550 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11216326 + ... + 11227521.

It is an arithmetic number, because the mean of its divisors is an integer number (11379030936).

Almost surely, 2^125640655506 is an apocalyptic number.

125640655506 is an abundant number, since it is smaller than the sum of its proper divisors (147456086958).

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

125640655506 is a wasteful number, since it uses less digits than its factorization.

125640655506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22444166 (or 22444163 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 125640655506 in words is "one hundred twenty-five billion, six hundred forty million, six hundred fifty-five thousand, five hundred six".