16651616500 has 24 divisors (see below), whose sum is σ = 36367131528. Its totient is φ = 6660646400.

The previous prime is 16651616491. The next prime is 16651616507. The reversal of 16651616500 is 561615661.

It can be written as a sum of positive squares in 4 ways, for example, as 338707216 + 16312909284 = 18404^2 + 127722^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16651616500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16651616507) 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, 16651117 + ... + 16652116.

It is an arithmetic number, because the mean of its divisors is an integer number (1515297147).

Almost surely, 2^16651616500 is an apocalyptic number.

16651616500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16651616500 is an abundant number, since it is smaller than the sum of its proper divisors (19715515028).

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

16651616500 is a wasteful number, since it uses less digits than its factorization.

16651616500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33303252 (or 33303240 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 16651616500 in words is "sixteen billion, six hundred fifty-one million, six hundred sixteen thousand, five hundred".