218132170664 has 32 divisors (see below), whose sum is σ = 426937945800. Its totient is φ = 104378699520.

The previous prime is 218132170657. The next prime is 218132170667. The reversal of 218132170664 is 466071231812.

It can be written as a sum of positive squares in 4 ways, for example, as 160360202500 + 57771968164 = 400450^2 + 240358^2 .

It is not an unprimeable number, because it can be changed into a prime (218132170667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6022379 + ... + 6058490.

Almost surely, 2^218132170664 is an apocalyptic number.

It is an amenable number.

218132170664 is a deficient number, since it is larger than the sum of its proper divisors (208805775136).

218132170664 is a wasteful number, since it uses less digits than its factorization.

218132170664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12080973 (or 12080969 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 218132170664 in words is "two hundred eighteen billion, one hundred thirty-two million, one hundred seventy thousand, six hundred sixty-four".