66217368 has 64 divisors (see below), whose sum is σ = 197429760. Its totient is φ = 18095616.

The previous prime is 66217357. The next prime is 66217379. The reversal of 66217368 is 86371266.

It is an interprime number because it is at equal distance from previous prime (66217357) and next prime (66217379).

It is a nude number because it is divisible by every one of its digits.

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, 4705 + ... + 12432.

It is an arithmetic number, because the mean of its divisors is an integer number (3084840).

Almost surely, 2^66217368 is an apocalyptic number.

It is an amenable number.

66217368 is an abundant number, since it is smaller than the sum of its proper divisors (131212392).

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

66217368 is a wasteful number, since it uses less digits than its factorization.

66217368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17176 (or 17172 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 66217368 is about 8137.4054833221. The cubic root of 66217368 is about 404.5671705764.

The spelling of 66217368 in words is "sixty-six million, two hundred seventeen thousand, three hundred sixty-eight".