12812959639 has 4 divisors (see below), whose sum is σ = 12835399720. Its totient is φ = 12790519560.

The previous prime is 12812959637. The next prime is 12812959657. The reversal of 12812959639 is 93695921821.

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 12812959639 - 2¹ = 12812959637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12812959639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12812959631) 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, 11219184 + ... + 11220325.

It is an arithmetic number, because the mean of its divisors is an integer number (3208849930).

Almost surely, 2^12812959639 is an apocalyptic number.

12812959639 is a deficient number, since it is larger than the sum of its proper divisors (22440081).

12812959639 is an equidigital number, since it uses as much as digits as its factorization.

12812959639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22440080.

The product of its digits is 2099520, while the sum is 55.

The spelling of 12812959639 in words is "twelve billion, eight hundred twelve million, nine hundred fifty-nine thousand, six hundred thirty-nine".