216554560544664 has 96 divisors (see below), whose sum is σ = 611622130392000. Its totient is φ = 71781586061472.

The previous prime is 216554560544653. The next prime is 216554560544681. The reversal of 216554560544664 is 466445065455612.

It is a happy number.

216554560544664 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 5 + 4 + 560 + 5 + 4 + 4 + 6 + 64 = 666.

It is a congruent number.

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, 310815094 + ... + 311511045.

It is an arithmetic number, because the mean of its divisors is an integer number (6371063858250).

Almost surely, 2^{216554560544664} is an apocalyptic number.

216554560544664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216554560544664 is an abundant number, since it is smaller than the sum of its proper divisors (395067569847336).

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

216554560544664 is a wasteful number, since it uses less digits than its factorization.

216554560544664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622326339 (or 622326323 counting only the distinct ones).

The product of its (nonzero) digits is 414720000, while the sum is 63.

The spelling of 216554560544664 in words is "two hundred sixteen trillion, five hundred fifty-four billion, five hundred sixty million, five hundred forty-four thousand, six hundred sixty-four".