6556157212720 has 20 divisors (see below), whose sum is σ = 15243065519760. Its totient is φ = 2622462885056.

The previous prime is 6556157212711. The next prime is 6556157212793. The reversal of 6556157212720 is 272127516556.

It is a tau number, because it is divible by the number of its divisors (20).

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, 40975982500 + ... + 40975982659.

It is an arithmetic number, because the mean of its divisors is an integer number (762153275988).

Almost surely, 2^{6556157212720} is an apocalyptic number.

It is an amenable number.

6556157212720 is an abundant number, since it is smaller than the sum of its proper divisors (8686908307040).

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

6556157212720 is a wasteful number, since it uses less digits than its factorization.

6556157212720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81951965172 (or 81951965166 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 49.

The spelling of 6556157212720 in words is "six trillion, five hundred fifty-six billion, one hundred fifty-seven million, two hundred twelve thousand, seven hundred twenty".