125137638891 has 6 divisors (see below), whose sum is σ = 180754367300. Its totient is φ = 83425092588.

The previous prime is 125137638889. The next prime is 125137638917. The reversal of 125137638891 is 198836731521.

125137638891 is a `hidden beast` number, since 1 + 2 + 513 + 7 + 6 + 38 + 8 + 91 = 666.

It is not a de Polignac number, because 125137638891 - 2¹ = 125137638889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125137631891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6952091041 + ... + 6952091058.

Almost surely, 2^125137638891 is an apocalyptic number.

125137638891 is a deficient number, since it is larger than the sum of its proper divisors (55616728409).

125137638891 is a wasteful number, since it uses less digits than its factorization.

125137638891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13904182105 (or 13904182102 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 125137638891 in words is "one hundred twenty-five billion, one hundred thirty-seven million, six hundred thirty-eight thousand, eight hundred ninety-one".