12665211562 has 4 divisors (see below), whose sum is σ = 18997817346. Its totient is φ = 6332605780.

The previous prime is 12665211511. The next prime is 12665211607. The reversal of 12665211562 is 26511256621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26511256621 = 135647 ⋅195443.

It can be written as a sum of positive squares in only one way, i.e., 11470195801 + 1195015761 = 107099^2 + 34569^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166302889 + ... + 3166302892.

Almost surely, 2^12665211562 is an apocalyptic number.

12665211562 is a deficient number, since it is larger than the sum of its proper divisors (6332605784).

12665211562 is an equidigital number, since it uses as much as digits as its factorization.

12665211562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332605783.

The product of its digits is 43200, while the sum is 37.

The spelling of 12665211562 in words is "twelve billion, six hundred sixty-five million, two hundred eleven thousand, five hundred sixty-two".