12977978080 has 24 divisors (see below), whose sum is σ = 30660473592. Its totient is φ = 5191191168.

The previous prime is 12977978077. The next prime is 12977978087. The reversal of 12977978080 is 8087977921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12977978087) 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, 40556022 + ... + 40556341.

It is an arithmetic number, because the mean of its divisors is an integer number (1277519733).

Almost surely, 2^12977978080 is an apocalyptic number.

12977978080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12977978080 is an abundant number, since it is smaller than the sum of its proper divisors (17682495512).

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

12977978080 is an equidigital number, since it uses as much as digits as its factorization.

12977978080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81112378 (or 81112370 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 58.

The spelling of 12977978080 in words is "twelve billion, nine hundred seventy-seven million, nine hundred seventy-eight thousand, eighty".