216566115220 has 48 divisors (see below), whose sum is σ = 559740117888. Its totient is φ = 68539605120.

The previous prime is 216566115217. The next prime is 216566115221. The reversal of 216566115220 is 22511665612.

It is a super-2 number, since 2×216566115220² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216566115220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216566115221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59494366 + ... + 59498005.

It is an arithmetic number, because the mean of its divisors is an integer number (11661252456).

Almost surely, 2^216566115220 is an apocalyptic number.

216566115220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216566115220 is an abundant number, since it is smaller than the sum of its proper divisors (343174002668).

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

216566115220 is a wasteful number, since it uses less digits than its factorization.

216566115220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118992400 (or 118992398 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 216566115220 in words is "two hundred sixteen billion, five hundred sixty-six million, one hundred fifteen thousand, two hundred twenty".