216501466500 has 144 divisors (see below), whose sum is σ = 745080126336. Its totient is φ = 52485192000.

The previous prime is 216501466469. The next prime is 216501466549. The reversal of 216501466500 is 5664105612.

216501466500 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 0 + 146 + 6 + 500 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2137384 + ... + 2236383.

It is an arithmetic number, because the mean of its divisors is an integer number (5174167544).

Almost surely, 2^216501466500 is an apocalyptic number.

216501466500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216501466500 is an abundant number, since it is smaller than the sum of its proper divisors (528578659836).

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

216501466500 is a wasteful number, since it uses less digits than its factorization.

216501466500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373803 (or 4373788 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 216501466500 in words is "two hundred sixteen billion, five hundred one million, four hundred sixty-six thousand, five hundred".