12909385780 has 12 divisors (see below), whose sum is σ = 27109710180. Its totient is φ = 5163754304.

The previous prime is 12909385763. The next prime is 12909385793. The reversal of 12909385780 is 8758390921.

It can be written as a sum of positive squares in 2 ways, for example, as 9284864164 + 3624521616 = 96358^2 + 60204^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322734625 + ... + 322734664.

It is an arithmetic number, because the mean of its divisors is an integer number (2259142515).

Almost surely, 2^12909385780 is an apocalyptic number.

12909385780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12909385780 is an abundant number, since it is smaller than the sum of its proper divisors (14200324400).

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

12909385780 is a wasteful number, since it uses less digits than its factorization.

12909385780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645469298 (or 645469296 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 12909385780 in words is "twelve billion, nine hundred nine million, three hundred eighty-five thousand, seven hundred eighty".