16720553688885 has 64 divisors (see below), whose sum is σ = 29959211089920. Its totient is φ = 8847639720000.

The previous prime is 16720553688863. The next prime is 16720553688913. The reversal of 16720553688885 is 58888635502761.

16720553688885 is a `hidden beast` number, since 1 + 6 + 7 + 2 + 0 + 5 + 536 + 8 + 8 + 8 + 85 = 666.

It is not a de Polignac number, because 16720553688885 - 2¹⁵ = 16720553656117 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16026540 + ... + 17037930.

It is an arithmetic number, because the mean of its divisors is an integer number (468112673280).

Almost surely, 2^{16720553688885} is an apocalyptic number.

16720553688885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16720553688885 is a deficient number, since it is larger than the sum of its proper divisors (13238657401035).

16720553688885 is a wasteful number, since it uses less digits than its factorization.

16720553688885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012367 (or 1012361 counting only the distinct ones).

The product of its (nonzero) digits is 774144000, while the sum is 72.

The spelling of 16720553688885 in words is "sixteen trillion, seven hundred twenty billion, five hundred fifty-three million, six hundred eighty-eight thousand, eight hundred eighty-five".