16651509864 has 96 divisors (see below), whose sum is σ = 48165684000. Its totient is φ = 4780321920.

The previous prime is 16651509851. The next prime is 16651509869. The reversal of 16651509864 is 46890515661.

It is a Smith number, since the sum of its digits (51) 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 (16651509869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95719 + ... + 206070.

It is an arithmetic number, because the mean of its divisors is an integer number (501725875).

Almost surely, 2^16651509864 is an apocalyptic number.

It is an amenable number.

16651509864 is an abundant number, since it is smaller than the sum of its proper divisors (31514174136).

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

16651509864 is a wasteful number, since it uses less digits than its factorization.

16651509864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301839 (or 301824 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 16651509864 in words is "sixteen billion, six hundred fifty-one million, five hundred nine thousand, eight hundred sixty-four".