216640660410 has 48 divisors (see below), whose sum is σ = 564252305760. Its totient is φ = 57669654240.

The previous prime is 216640660387. The next prime is 216640660421. The reversal of 216640660410 is 14066046612.

216640660410 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 40 + 6 + 604 + 1 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2056420 + ... + 2159199.

It is an arithmetic number, because the mean of its divisors is an integer number (11755256370).

Almost surely, 2^216640660410 is an apocalyptic number.

216640660410 is an abundant number, since it is smaller than the sum of its proper divisors (347611645350).

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

216640660410 is a wasteful number, since it uses less digits than its factorization.

216640660410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216203 (or 4216200 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 216640660410 in words is "two hundred sixteen billion, six hundred forty million, six hundred sixty thousand, four hundred ten".