12640378778880 has 72 divisors (see below), whose sum is σ = 40370209737312. Its totient is φ = 3370767673344.

The previous prime is 12640378778831. The next prime is 12640378778887. The reversal of 12640378778880 is 8887787304621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640378778887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645878814 + ... + 1645886493.

Almost surely, 2^{12640378778880} is an apocalyptic number.

12640378778880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12640378778880 is an abundant number, since it is smaller than the sum of its proper divisors (27729830958432).

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

12640378778880 is an equidigital number, since it uses as much as digits as its factorization.

12640378778880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291765331 (or 3291765317 counting only the distinct ones).

The product of its (nonzero) digits is 202309632, while the sum is 69.

The spelling of 12640378778880 in words is "twelve trillion, six hundred forty billion, three hundred seventy-eight million, seven hundred seventy-eight thousand, eight hundred eighty".