12539125065 has 32 divisors (see below), whose sum is σ = 20503042560. Its totient is φ = 6540908544.

The previous prime is 12539125061. The next prime is 12539125091. The reversal of 12539125065 is 56052193521.

It is not a de Polignac number, because 12539125065 - 2² = 12539125061 is a prime.

It is a super-2 number, since 2×12539125065² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12539125061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1247781 + ... + 1257789.

It is an arithmetic number, because the mean of its divisors is an integer number (640720080).

Almost surely, 2^12539125065 is an apocalyptic number.

12539125065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12539125065 is a deficient number, since it is larger than the sum of its proper divisors (7963917495).

12539125065 is a wasteful number, since it uses less digits than its factorization.

12539125065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11841.

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 12539125065 in words is "twelve billion, five hundred thirty-nine million, one hundred twenty-five thousand, sixty-five".