12539597745 has 32 divisors (see below), whose sum is σ = 20479651200. Its totient is φ = 6549868544.

The previous prime is 12539597717. The next prime is 12539597771. The reversal of 12539597745 is 54779593521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12539597745 - 2⁸ = 12539597489 is a prime.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 211729 + ... + 264401.

It is an arithmetic number, because the mean of its divisors is an integer number (639989100).

Almost surely, 2^12539597745 is an apocalyptic number.

12539597745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12539597745 is a deficient number, since it is larger than the sum of its proper divisors (7940053455).

12539597745 is a wasteful number, since it uses less digits than its factorization.

12539597745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53009.

The product of its digits is 11907000, while the sum is 57.

The spelling of 12539597745 in words is "twelve billion, five hundred thirty-nine million, five hundred ninety-seven thousand, seven hundred forty-five".