16621920504 has 96 divisors (see below), whose sum is σ = 53108490240. Its totient is φ = 4595918400.

The previous prime is 16621920487. The next prime is 16621920509. The reversal of 16621920504 is 40502912661.

16621920504 is a `hidden beast` number, since 1 + 6 + 62 + 1 + 92 + 0 + 504 = 666.

It is a super-2 number, since 2×16621920504² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621920509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516312 + ... + 547559.

It is an arithmetic number, because the mean of its divisors is an integer number (553213440).

Almost surely, 2^16621920504 is an apocalyptic number.

16621920504 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16621920504 is an abundant number, since it is smaller than the sum of its proper divisors (36486569736).

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

16621920504 is a wasteful number, since it uses less digits than its factorization.

16621920504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063921 (or 1063914 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 16621920504 in words is "sixteen billion, six hundred twenty-one million, nine hundred twenty thousand, five hundred four".