12976450639 has 4 divisors (see below), whose sum is σ = 13189179400. Its totient is φ = 12763721880.

The previous prime is 12976450621. The next prime is 12976450667. The reversal of 12976450639 is 93605467921.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12976450639 - 2¹⁵ = 12976417871 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 (12976450699) 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, 106364289 + ... + 106364410.

It is an arithmetic number, because the mean of its divisors is an integer number (3297294850).

Almost surely, 2^12976450639 is an apocalyptic number.

12976450639 is a deficient number, since it is larger than the sum of its proper divisors (212728761).

12976450639 is an equidigital number, since it uses as much as digits as its factorization.

12976450639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212728760.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 12976450639 in words is "twelve billion, nine hundred seventy-six million, four hundred fifty thousand, six hundred thirty-nine".