216884314661 has 4 divisors (see below), whose sum is σ = 247867788192. Its totient is φ = 185900841132.

The previous prime is 216884314649. The next prime is 216884314663. The reversal of 216884314661 is 166413488612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216884314661 - 2¹⁰ = 216884313637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216884314663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15491736755 + ... + 15491736768.

It is an arithmetic number, because the mean of its divisors is an integer number (61966947048).

Almost surely, 2^216884314661 is an apocalyptic number.

It is an amenable number.

216884314661 is a deficient number, since it is larger than the sum of its proper divisors (30983473531).

216884314661 is an equidigital number, since it uses as much as digits as its factorization.

216884314661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30983473530.

The product of its digits is 1327104, while the sum is 50.

The spelling of 216884314661 in words is "two hundred sixteen billion, eight hundred eighty-four million, three hundred fourteen thousand, six hundred sixty-one".