125515985839 has 4 divisors (see below), whose sum is σ = 129564888640. Its totient is φ = 121467083040.

The previous prime is 125515985827. The next prime is 125515985863. The reversal of 125515985839 is 938589515521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125515985839 - 2⁵ = 125515985807 is a prime.

It is a super-2 number, since 2×125515985839² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125515985809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2024451354 + ... + 2024451415.

It is an arithmetic number, because the mean of its divisors is an integer number (32391222160).

Almost surely, 2^125515985839 is an apocalyptic number.

125515985839 is a deficient number, since it is larger than the sum of its proper divisors (4048902801).

125515985839 is an equidigital number, since it uses as much as digits as its factorization.

125515985839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048902800.

The product of its digits is 19440000, while the sum is 61.

The spelling of 125515985839 in words is "one hundred twenty-five billion, five hundred fifteen million, nine hundred eighty-five thousand, eight hundred thirty-nine".