125555802817 has 2 divisors, whose sum is σ = 125555802818. Its totient is φ = 125555802816.

The previous prime is 125555802811. The next prime is 125555802857. The reversal of 125555802817 is 718208555521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68171121216 + 57384681601 = 261096^2 + 239551^2 .

It is a cyclic number.

It is not a de Polignac number, because 125555802817 - 2³ = 125555802809 is a prime.

It is not a weakly prime, because it can be changed into another prime (125555802811) 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 as a sum of consecutive naturals, namely, 62777901408 + 62777901409.

It is an arithmetic number, because the mean of its divisors is an integer number (62777901409).

Almost surely, 2^125555802817 is an apocalyptic number.

It is an amenable number.

125555802817 is a deficient number, since it is larger than the sum of its proper divisors (1).

125555802817 is an equidigital number, since it uses as much as digits as its factorization.

125555802817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120000, while the sum is 49.

The spelling of 125555802817 in words is "one hundred twenty-five billion, five hundred fifty-five million, eight hundred two thousand, eight hundred seventeen".