16631021304 has 64 divisors (see below), whose sum is σ = 46491626400. Its totient is φ = 5508352512.

The previous prime is 16631021261. The next prime is 16631021339. The reversal of 16631021304 is 40312013661.

16631021304 is a `hidden beast` number, since 1 + 6 + 631 + 0 + 21 + 3 + 0 + 4 = 666.

It is a super-2 number, since 2×16631021304² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 211297 + ... + 279120.

Almost surely, 2^16631021304 is an apocalyptic number.

It is an amenable number.

16631021304 is an abundant number, since it is smaller than the sum of its proper divisors (29860605096).

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

16631021304 is a wasteful number, since it uses less digits than its factorization.

16631021304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490589 (or 490579 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 16631021304 its reverse (40312013661), we get a palindrome (56943034965).

The spelling of 16631021304 in words is "sixteen billion, six hundred thirty-one million, twenty-one thousand, three hundred four".