216211333864 has 8 divisors (see below), whose sum is σ = 405396251010. Its totient is φ = 108105666928.

The previous prime is 216211333843. The next prime is 216211333879. The reversal of 216211333864 is 468333112612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 210580032100 + 5631301764 = 458890^2 + 75042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13513208359 + ... + 13513208374.

Almost surely, 2^216211333864 is an apocalyptic number.

It is an amenable number.

216211333864 is a deficient number, since it is larger than the sum of its proper divisors (189184917146).

216211333864 is a wasteful number, since it uses less digits than its factorization.

216211333864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27026416739 (or 27026416735 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The spelling of 216211333864 in words is "two hundred sixteen billion, two hundred eleven million, three hundred thirty-three thousand, eight hundred sixty-four".