216264620444664 has 64 divisors (see below), whose sum is σ = 620855369712000. Its totient is φ = 62085536968320.

The previous prime is 216264620444647. The next prime is 216264620444773. The reversal of 216264620444664 is 466444026462612.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

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, 21557473099 + ... + 21557483130.

It is an arithmetic number, because the mean of its divisors is an integer number (9700865151750).

Almost surely, 2^{216264620444664} is an apocalyptic number.

216264620444664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216264620444664 is an abundant number, since it is smaller than the sum of its proper divisors (404590749267336).

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

216264620444664 is a wasteful number, since it uses less digits than its factorization.

216264620444664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43114956268 (or 43114956264 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 57.

The spelling of 216264620444664 in words is "two hundred sixteen trillion, two hundred sixty-four billion, six hundred twenty million, four hundred forty-four thousand, six hundred sixty-four".