72217665306660 has 24 divisors (see below), whose sum is σ = 202209462858816. Its totient is φ = 19258044081760.

The previous prime is 72217665306659. The next prime is 72217665306679. The reversal of 72217665306660 is 6660356671227.

It is a self number, because there is not a number n which added to its sum of digits gives 72217665306660.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601813877496 + ... + 601813877615.

It is an arithmetic number, because the mean of its divisors is an integer number (8425394285784).

Almost surely, 2^{72217665306660} is an apocalyptic number.

It is an amenable number.

72217665306660 is an abundant number, since it is smaller than the sum of its proper divisors (129991797552156).

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

72217665306660 is a wasteful number, since it uses less digits than its factorization.

72217665306660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203627755123 (or 1203627755121 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 57.

The spelling of 72217665306660 in words is "seventy-two trillion, two hundred seventeen billion, six hundred sixty-five million, three hundred six thousand, six hundred sixty".