66365281 has 8 divisors (see below), whose sum is σ = 69546240. Its totient is φ = 63208992.

The previous prime is 66365251. The next prime is 66365291. The reversal of 66365281 is 18256366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66365281 is a prime.

It is a super-2 number, since 2×66365281² = 8808701044417922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66365281.

It is not an unprimeable number, because it can be changed into a prime (66365231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540 + ... + 11533.

It is an arithmetic number, because the mean of its divisors is an integer number (8693280).

Almost surely, 2^66365281 is an apocalyptic number.

It is an amenable number.

66365281 is a deficient number, since it is larger than the sum of its proper divisors (3180959).

66365281 is a wasteful number, since it uses less digits than its factorization.

66365281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12335.

The product of its digits is 51840, while the sum is 37.

The square root of 66365281 is about 8146.4888755831. The cubic root of 66365281 is about 404.8681804399.

The spelling of 66365281 in words is "sixty-six million, three hundred sixty-five thousand, two hundred eighty-one".