216690886686608 has 20 divisors (see below), whose sum is σ = 420268315189260. Its totient is φ = 108234547282944.

The previous prime is 216690886686551. The next prime is 216690886686611. The reversal of 216690886686608 is 806686688096612.

It can be written as a sum of positive squares in 2 ways, for example, as 150679356623104 + 66011530063504 = 12275152^2 + 8124748^2 .

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, 6930987653 + ... + 6931018916.

It is an arithmetic number, because the mean of its divisors is an integer number (21013415759463).

Almost surely, 2^{216690886686608} is an apocalyptic number.

It is an amenable number.

216690886686608 is a deficient number, since it is larger than the sum of its proper divisors (203577428502652).

216690886686608 is a wasteful number, since it uses less digits than its factorization.

216690886686608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13862007554 (or 13862007548 counting only the distinct ones).

The product of its (nonzero) digits is 3439853568, while the sum is 80.

The spelling of 216690886686608 in words is "two hundred sixteen trillion, six hundred ninety billion, eight hundred eighty-six million, six hundred eighty-six thousand, six hundred eight".