16621026121680 has 80 divisors (see below), whose sum is σ = 51525720279744. Its totient is φ = 4432227240960.

The previous prime is 16621026121627. The next prime is 16621026121717. The reversal of 16621026121680 is 8612162012661.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 26868660 + ... + 27480300.

Almost surely, 2^{16621026121680} is an apocalyptic number.

16621026121680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16621026121680 is an abundant number, since it is smaller than the sum of its proper divisors (34904694158064).

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

16621026121680 is a wasteful number, since it uses less digits than its factorization.

16621026121680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724884 (or 724878 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 16621026121680 in words is "sixteen trillion, six hundred twenty-one billion, twenty-six million, one hundred twenty-one thousand, six hundred eighty".