12636465605 has 4 divisors (see below), whose sum is σ = 15163758732. Its totient is φ = 10109172480.

The previous prime is 12636465601. The next prime is 12636465607. The reversal of 12636465605 is 50656463621.

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 6009040324 + 6627425281 = 77518^2 + 81409^2 .

It is not a de Polignac number, because 12636465605 - 2² = 12636465601 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 (12636465601) 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, 1263646556 + ... + 1263646565.

It is an arithmetic number, because the mean of its divisors is an integer number (3790939683).

Almost surely, 2^12636465605 is an apocalyptic number.

It is an amenable number.

12636465605 is a deficient number, since it is larger than the sum of its proper divisors (2527293127).

12636465605 is an equidigital number, since it uses as much as digits as its factorization.

12636465605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527293126.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 12636465605 in words is "twelve billion, six hundred thirty-six million, four hundred sixty-five thousand, six hundred five".