12865537597 has 6 divisors (see below), whose sum is σ = 14141458814. Its totient is φ = 11695943160.

The previous prime is 12865537567. The next prime is 12865537613. The reversal of 12865537597 is 79573556821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11969672836 + 895864761 = 109406^2 + 29931^2 .

It is not a de Polignac number, because 12865537597 - 2²⁷ = 12731319869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12865537567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53163258 + ... + 53163499.

Almost surely, 2^12865537597 is an apocalyptic number.

It is an amenable number.

12865537597 is a deficient number, since it is larger than the sum of its proper divisors (1275921217).

12865537597 is a wasteful number, since it uses less digits than its factorization.

12865537597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106326779 (or 106326768 counting only the distinct ones).

The product of its digits is 15876000, while the sum is 58.

The spelling of 12865537597 in words is "twelve billion, eight hundred sixty-five million, five hundred thirty-seven thousand, five hundred ninety-seven".