125918685889 has 2 divisors, whose sum is σ = 125918685890. Its totient is φ = 125918685888.

The previous prime is 125918685881. The next prime is 125918685911. The reversal of 125918685889 is 988586819521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103787065600 + 22131620289 = 322160^2 + 148767^2 .

It is a cyclic number.

It is not a de Polignac number, because 125918685889 - 2³ = 125918685881 is a prime.

It is not a weakly prime, because it can be changed into another prime (125918685881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62959342944 + 62959342945.

It is an arithmetic number, because the mean of its divisors is an integer number (62959342945).

Almost surely, 2^125918685889 is an apocalyptic number.

It is an amenable number.

125918685889 is a deficient number, since it is larger than the sum of its proper divisors (1).

125918685889 is an equidigital number, since it uses as much as digits as its factorization.

125918685889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99532800, while the sum is 70.

The spelling of 125918685889 in words is "one hundred twenty-five billion, nine hundred eighteen million, six hundred eighty-five thousand, eight hundred eighty-nine".