125938518817 has 2 divisors, whose sum is σ = 125938518818. Its totient is φ = 125938518816.

The previous prime is 125938518803. The next prime is 125938518829. The reversal of 125938518817 is 718815839521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104409119376 + 21529399441 = 323124^2 + 146729^2 .

It is a cyclic number.

It is not a de Polignac number, because 125938518817 - 2¹⁹ = 125937994529 is a prime.

It is not a weakly prime, because it can be changed into another prime (125938518317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62969259408 + 62969259409.

It is an arithmetic number, because the mean of its divisors is an integer number (62969259409).

Almost surely, 2^125938518817 is an apocalyptic number.

It is an amenable number.

125938518817 is a deficient number, since it is larger than the sum of its proper divisors (1).

125938518817 is an equidigital number, since it uses as much as digits as its factorization.

125938518817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 58.

The spelling of 125938518817 in words is "one hundred twenty-five billion, nine hundred thirty-eight million, five hundred eighteen thousand, eight hundred seventeen".