216555508874 has 4 divisors (see below), whose sum is σ = 324833263314. Its totient is φ = 108277754436.

The previous prime is 216555508811. The next prime is 216555508877. The reversal of 216555508874 is 478805555612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 139945572649 + 76609936225 = 374093^2 + 276785^2 .

It is not an unprimeable number, because it can be changed into a prime (216555508877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54138877217 + ... + 54138877220.

Almost surely, 2^216555508874 is an apocalyptic number.

216555508874 is a deficient number, since it is larger than the sum of its proper divisors (108277754440).

216555508874 is a wasteful number, since it uses less digits than its factorization.

216555508874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108277754439.

The product of its (nonzero) digits is 13440000, while the sum is 56.

The spelling of 216555508874 in words is "two hundred sixteen billion, five hundred fifty-five million, five hundred eight thousand, eight hundred seventy-four".