218720686264 has 8 divisors (see below), whose sum is σ = 410101286760. Its totient is φ = 109360343128.

The previous prime is 218720686207. The next prime is 218720686271. The reversal of 218720686264 is 462686027812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13670042884 + ... + 13670042899.

It is an arithmetic number, because the mean of its divisors is an integer number (51262660845).

Almost surely, 2^218720686264 is an apocalyptic number.

It is an amenable number.

218720686264 is a deficient number, since it is larger than the sum of its proper divisors (191380600496).

218720686264 is a wasteful number, since it uses less digits than its factorization.

218720686264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27340085789 (or 27340085785 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 218720686264 in words is "two hundred eighteen billion, seven hundred twenty million, six hundred eighty-six thousand, two hundred sixty-four".