216761536764 has 36 divisors (see below), whose sum is σ = 548067186576. Its totient is φ = 72235095168.

The previous prime is 216761536757. The next prime is 216761536787. The reversal of 216761536764 is 467635167612.

216761536764 is a `hidden beast` number, since 2 + 16 + 7 + 615 + 3 + 6 + 7 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 216761536764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640269 + ... + 918404.

It is an arithmetic number, because the mean of its divisors is an integer number (15224088516).

Almost surely, 2^216761536764 is an apocalyptic number.

It is an amenable number.

216761536764 is an abundant number, since it is smaller than the sum of its proper divisors (331305649812).

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

216761536764 is a wasteful number, since it uses less digits than its factorization.

216761536764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562546 (or 1562541 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 216761536764 in words is "two hundred sixteen billion, seven hundred sixty-one million, five hundred thirty-six thousand, seven hundred sixty-four".