6645220792704 has 192 divisors, whose sum is σ = 21303376239600. Its totient is φ = 1974176870400.

The previous prime is 6645220792673. The next prime is 6645220792781. The reversal of 6645220792704 is 4072970225466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7216122 + ... + 8084729.

Almost surely, 2^{6645220792704} is an apocalyptic number.

6645220792704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6645220792704 is an abundant number, since it is smaller than the sum of its proper divisors (14658155446896).

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

6645220792704 is a wasteful number, since it uses less digits than its factorization.

6645220792704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15300913 (or 15300898 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 6645220792704 in words is "six trillion, six hundred forty-five billion, two hundred twenty million, seven hundred ninety-two thousand, seven hundred four".