6642644097378 has 64 divisors (see below), whose sum is σ = 14078914560000. Its totient is φ = 2082169361664.

The previous prime is 6642644097373. The next prime is 6642644097379. The reversal of 6642644097378 is 8737904462466.

It is not an unprimeable number, because it can be changed into a prime (6642644097371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 722100423 + ... + 722109621.

It is an arithmetic number, because the mean of its divisors is an integer number (219983040000).

Almost surely, 2^{6642644097378} is an apocalyptic number.

6642644097378 is an abundant number, since it is smaller than the sum of its proper divisors (7436270462622).

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

6642644097378 is a wasteful number, since it uses less digits than its factorization.

6642644097378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14559.

The product of its (nonzero) digits is 292626432, while the sum is 66.

The spelling of 6642644097378 in words is "six trillion, six hundred forty-two billion, six hundred forty-four million, ninety-seven thousand, three hundred seventy-eight".