125531665257 has 8 divisors (see below), whose sum is σ = 167443963776. Its totient is φ = 83653571792.

The previous prime is 125531665241. The next prime is 125531665271. The reversal of 125531665257 is 752566135521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125531665257 - 2⁴ = 125531665241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125531665957) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 8542698 + ... + 8557379.

It is an arithmetic number, because the mean of its divisors is an integer number (20930495472).

Almost surely, 2^125531665257 is an apocalyptic number.

It is an amenable number.

125531665257 is a deficient number, since it is larger than the sum of its proper divisors (41912298519).

125531665257 is a wasteful number, since it uses less digits than its factorization.

125531665257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17102527.

The product of its digits is 1890000, while the sum is 48.

The spelling of 125531665257 in words is "one hundred twenty-five billion, five hundred thirty-one million, six hundred sixty-five thousand, two hundred fifty-seven".