16720005664564 has 24 divisors (see below), whose sum is σ = 29298818897600. Its totient is φ = 8348918883840.

The previous prime is 16720005664511. The next prime is 16720005664577. The reversal of 16720005664564 is 46546650002761.

It is a happy number.

It is a super-3 number, since 3×16720005664564³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14970004 + ... + 16048084.

Almost surely, 2^{16720005664564} is an apocalyptic number.

It is an amenable number.

16720005664564 is a deficient number, since it is larger than the sum of its proper divisors (12578813233036).

16720005664564 is a wasteful number, since it uses less digits than its factorization.

16720005664564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083223 (or 1083221 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 52.

The spelling of 16720005664564 in words is "sixteen trillion, seven hundred twenty billion, five million, six hundred sixty-four thousand, five hundred sixty-four".