217774700804864 has 144 divisors (see below), whose sum is σ = 512842098585600. Its totient is φ = 90318168944640.

The previous prime is 217774700804797. The next prime is 217774700804879. The reversal of 217774700804864 is 468408007477712.

It is a self number, because there is not a number n which added to its sum of digits gives 217774700804864.

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, 2299749902 + ... + 2299844594.

It is an arithmetic number, because the mean of its divisors is an integer number (3561403462400).

Almost surely, 2^{217774700804864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217774700804864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256421049292800).

217774700804864 is an abundant number, since it is smaller than the sum of its proper divisors (295067397780736).

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

217774700804864 is an equidigital number, since it uses as much as digits as its factorization.

217774700804864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136146 (or 136132 counting only the distinct ones).

The product of its (nonzero) digits is 118013952, while the sum is 65.

The spelling of 217774700804864 in words is "two hundred seventeen trillion, seven hundred seventy-four billion, seven hundred million, eight hundred four thousand, eight hundred sixty-four".