12999565780 has 48 divisors (see below), whose sum is σ = 29609946576. Its totient is φ = 4774584320.

The previous prime is 12999565751. The next prime is 12999565807. The reversal of 12999565780 is 8756599921.

It can be written as a sum of positive squares in 8 ways, for example, as 3743971344 + 9255594436 = 61188^2 + 96206^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452329 + ... + 480208.

It is an arithmetic number, because the mean of its divisors is an integer number (616873887).

Almost surely, 2^12999565780 is an apocalyptic number.

12999565780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12999565780 is an abundant number, since it is smaller than the sum of its proper divisors (16610380796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12999565780 is a wasteful number, since it uses less digits than its factorization.

12999565780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932604 (or 932602 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 61.

The spelling of 12999565780 in words is "twelve billion, nine hundred ninety-nine million, five hundred sixty-five thousand, seven hundred eighty".