216601636228 has 6 divisors (see below), whose sum is σ = 379052863406. Its totient is φ = 108300818112.

The previous prime is 216601636219. The next prime is 216601636243. The reversal of 216601636228 is 822636106612.

It can be written as a sum of positive squares in only one way, i.e., 185030743104 + 31570893124 = 430152^2 + 177682^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27075204525 + ... + 27075204532.

Almost surely, 2^216601636228 is an apocalyptic number.

It is an amenable number.

216601636228 is a deficient number, since it is larger than the sum of its proper divisors (162451227178).

216601636228 is a wasteful number, since it uses less digits than its factorization.

216601636228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54150409061 (or 54150409059 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 216601636228 in words is "two hundred sixteen billion, six hundred one million, six hundred thirty-six thousand, two hundred twenty-eight".