66368491 has 12 divisors (see below), whose sum is σ = 79292928. Its totient is φ = 55348272.

The previous prime is 66368483. The next prime is 66368503. The reversal of 66368491 is 19486366.

It is not a de Polignac number, because 66368491 - 2³ = 66368483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66368411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16491 + ... + 20116.

It is an arithmetic number, because the mean of its divisors is an integer number (6607744).

Almost surely, 2^66368491 is an apocalyptic number.

66368491 is a deficient number, since it is larger than the sum of its proper divisors (12924437).

66368491 is a wasteful number, since it uses less digits than its factorization.

66368491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36658 (or 36651 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 66368491 is about 8146.6858905938. The cubic root of 66368491 is about 404.8747079790.

The spelling of 66368491 in words is "sixty-six million, three hundred sixty-eight thousand, four hundred ninety-one".