16721648320 has 56 divisors (see below), whose sum is σ = 42881391504. Its totient is φ = 6174145536.

The previous prime is 16721648311. The next prime is 16721648351. The reversal of 16721648320 is 2384612761.

It is a super-2 number, since 2×16721648320² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005654 + ... + 2013973.

It is an arithmetic number, because the mean of its divisors is an integer number (765739134).

Almost surely, 2^16721648320 is an apocalyptic number.

16721648320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16721648320 is an abundant number, since it is smaller than the sum of its proper divisors (26159743184).

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

16721648320 is a wasteful number, since it uses less digits than its factorization.

16721648320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4019657 (or 4019647 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 16721648320 in words is "sixteen billion, seven hundred twenty-one million, six hundred forty-eight thousand, three hundred twenty".