16556880216620 has 48 divisors (see below), whose sum is σ = 34876766453760. Its totient is φ = 6602326186176.

The previous prime is 16556880216619. The next prime is 16556880216659. The reversal of 16556880216620 is 2661208865561.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16515029 + ... + 17488851.

It is an arithmetic number, because the mean of its divisors is an integer number (726599301120).

Almost surely, 2^{16556880216620} is an apocalyptic number.

16556880216620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16556880216620 is an abundant number, since it is smaller than the sum of its proper divisors (18319886237140).

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

16556880216620 is a wasteful number, since it uses less digits than its factorization.

16556880216620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976454 (or 976452 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 56.

The spelling of 16556880216620 in words is "sixteen trillion, five hundred fifty-six billion, eight hundred eighty million, two hundred sixteen thousand, six hundred twenty".