216545516066 has 32 divisors (see below), whose sum is σ = 360608495616. Its totient is φ = 96700338000.

The previous prime is 216545516059. The next prime is 216545516107. The reversal of 216545516066 is 660615545612.

It is a self number, because there is not a number n which added to its sum of digits gives 216545516066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197111 + ... + 686981.

It is an arithmetic number, because the mean of its divisors is an integer number (11269015488).

Almost surely, 2^216545516066 is an apocalyptic number.

216545516066 is a deficient number, since it is larger than the sum of its proper divisors (144062979550).

216545516066 is a wasteful number, since it uses less digits than its factorization.

216545516066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490238.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 216545516066 in words is "two hundred sixteen billion, five hundred forty-five million, five hundred sixteen thousand, sixty-six".