12636738577 has 4 divisors (see below), whose sum is σ = 12641540580. Its totient is φ = 12631936576.

The previous prime is 12636738473. The next prime is 12636738581. The reversal of 12636738577 is 77583763621.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1055535121 + 11581203456 = 32489^2 + 107616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12636738577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12636738277) 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, 2397052 + ... + 2402317.

It is an arithmetic number, because the mean of its divisors is an integer number (3160385145).

Almost surely, 2^12636738577 is an apocalyptic number.

It is an amenable number.

12636738577 is a deficient number, since it is larger than the sum of its proper divisors (4802003).

12636738577 is an equidigital number, since it uses as much as digits as its factorization.

12636738577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4802002.

The product of its digits is 8890560, while the sum is 55.

The spelling of 12636738577 in words is "twelve billion, six hundred thirty-six million, seven hundred thirty-eight thousand, five hundred seventy-seven".