216557724164 has 24 divisors (see below), whose sum is σ = 399074692800. Its totient is φ = 102540742560.

The previous prime is 216557724143. The next prime is 216557724179. The reversal of 216557724164 is 461427755612.

It is a happy number.

It is a super-2 number, since 2×216557724164² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344384 + ... + 742775.

It is an arithmetic number, because the mean of its divisors is an integer number (16628112200).

Almost surely, 2^216557724164 is an apocalyptic number.

It is an amenable number.

216557724164 is a deficient number, since it is larger than the sum of its proper divisors (182516968636).

216557724164 is a wasteful number, since it uses less digits than its factorization.

216557724164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089803 (or 1089801 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 50.

The spelling of 216557724164 in words is "two hundred sixteen billion, five hundred fifty-seven million, seven hundred twenty-four thousand, one hundred sixty-four".