66517165507216 has 20 divisors (see below), whose sum is σ = 128877406710912. Its totient is φ = 33258479904416.

The previous prime is 66517165507171. The next prime is 66517165507223. The reversal of 66517165507216 is 61270556171566.

It is a super-2 number, since 2×66517165507216² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951016 + ... + 11573191.

Almost surely, 2^{66517165507216} is an apocalyptic number.

It is an amenable number.

66517165507216 is a deficient number, since it is larger than the sum of its proper divisors (62360241203696).

66517165507216 is a wasteful number, since it uses less digits than its factorization.

66517165507216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12856158 (or 12856152 counting only the distinct ones).

The product of its (nonzero) digits is 15876000, while the sum is 58.

The spelling of 66517165507216 in words is "sixty-six trillion, five hundred seventeen billion, one hundred sixty-five million, five hundred seven thousand, two hundred sixteen".