16644265320 has 32 divisors (see below), whose sum is σ = 49932796320. Its totient is φ = 4438470720.

The previous prime is 16644265301. The next prime is 16644265321. The reversal of 16644265320 is 2356244661.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16644265321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69350986 + ... + 69351225.

It is an arithmetic number, because the mean of its divisors is an integer number (1560399885).

Almost surely, 2^16644265320 is an apocalyptic number.

16644265320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16644265320 is an abundant number, since it is smaller than the sum of its proper divisors (33288531000).

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

16644265320 is a wasteful number, since it uses less digits than its factorization.

16644265320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138702225 (or 138702221 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 16644265320 in words is "sixteen billion, six hundred forty-four million, two hundred sixty-five thousand, three hundred twenty".