216561056236 has 12 divisors (see below), whose sum is σ = 433122112528. Its totient is φ = 92811881232.

The previous prime is 216561056207. The next prime is 216561056263. The reversal of 216561056236 is 632650165612.

216561056236 is an admirable number.

It is a super-4 number, since 4×216561056236⁴ (a number of 46 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216561056192 and 216561056201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3867161691 + ... + 3867161746.

Almost surely, 2^216561056236 is an apocalyptic number.

It is an amenable number.

216561056236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216561056236 is a wasteful number, since it uses less digits than its factorization.

216561056236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734323448 (or 7734323446 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 216561056236 in words is "two hundred sixteen billion, five hundred sixty-one million, fifty-six thousand, two hundred thirty-six".