12565396993 has 4 divisors (see below), whose sum is σ = 12567290068. Its totient is φ = 12563503920.

The previous prime is 12565396969. The next prime is 12565396999. The reversal of 12565396993 is 39969356521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39969356521 = 419 ⋅95392259.

It can be written as a sum of positive squares in 2 ways, for example, as 8595514944 + 3969882049 = 92712^2 + 63007^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565396993 - 2³³ = 3975462401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12565396999) 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, 936546 + ... + 949867.

It is an arithmetic number, because the mean of its divisors is an integer number (3141822517).

Almost surely, 2^12565396993 is an apocalyptic number.

It is an amenable number.

12565396993 is a deficient number, since it is larger than the sum of its proper divisors (1893075).

12565396993 is an equidigital number, since it uses as much as digits as its factorization.

12565396993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893074.

The product of its digits is 11809800, while the sum is 58.

The spelling of 12565396993 in words is "twelve billion, five hundred sixty-five million, three hundred ninety-six thousand, nine hundred ninety-three".