125137638917 has 2 divisors, whose sum is σ = 125137638918. Its totient is φ = 125137638916.

The previous prime is 125137638889. The next prime is 125137639007. The reversal of 125137638917 is 719836731521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118445417281 + 6692221636 = 344159^2 + 81806^2 .

It is a cyclic number.

It is not a de Polignac number, because 125137638917 - 2²² = 125133444613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125137638317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62568819458 + 62568819459.

It is an arithmetic number, because the mean of its divisors is an integer number (62568819459).

Almost surely, 2^125137638917 is an apocalyptic number.

It is an amenable number.

125137638917 is a deficient number, since it is larger than the sum of its proper divisors (1).

125137638917 is an equidigital number, since it uses as much as digits as its factorization.

125137638917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The spelling of 125137638917 in words is "one hundred twenty-five billion, one hundred thirty-seven million, six hundred thirty-eight thousand, nine hundred seventeen".