16601398920 has 96 divisors (see below), whose sum is σ = 54714553920. Its totient is φ = 4364680320.

The previous prime is 16601398897. The next prime is 16601398939. The reversal of 16601398920 is 2989310661.

It is a happy number.

16601398920 is a `hidden beast` number, since 1 + 6 + 601 + 39 + 8 + 9 + 2 + 0 = 666.

It is a super-2 number, since 2×16601398920² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299194 + ... + 350313.

It is an arithmetic number, because the mean of its divisors is an integer number (569943270).

Almost surely, 2^16601398920 is an apocalyptic number.

16601398920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16601398920 is an abundant number, since it is smaller than the sum of its proper divisors (38113155000).

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

16601398920 is a wasteful number, since it uses less digits than its factorization.

16601398920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649595 (or 649588 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 16601398920 in words is "sixteen billion, six hundred one million, three hundred ninety-eight thousand, nine hundred twenty".