12636219994 has 4 divisors (see below), whose sum is σ = 18954329994. Its totient is φ = 6318109996.

The previous prime is 12636219991. The next prime is 12636220001. The reversal of 12636219994 is 49991263621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12554082025 + 82137969 = 112045^2 + 9063^2 .

It is not an unprimeable number, because it can be changed into a prime (12636219991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159054997 + ... + 3159055000.

Almost surely, 2^12636219994 is an apocalyptic number.

12636219994 is a deficient number, since it is larger than the sum of its proper divisors (6318110000).

12636219994 is an equidigital number, since it uses as much as digits as its factorization.

12636219994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318109999.

The product of its digits is 1259712, while the sum is 52.

The spelling of 12636219994 in words is "twelve billion, six hundred thirty-six million, two hundred nineteen thousand, nine hundred ninety-four".