66562139 has 6 divisors (see below), whose sum is σ = 77429484. Its totient is φ = 57053220.

The previous prime is 66562129. The next prime is 66562169. The reversal of 66562139 is 93126566.

It is a de Polignac number, because none of the positive numbers 2^k-66562139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66562129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 679157 + ... + 679254.

It is an arithmetic number, because the mean of its divisors is an integer number (12904914).

Almost surely, 2^66562139 is an apocalyptic number.

66562139 is a deficient number, since it is larger than the sum of its proper divisors (10867345).

66562139 is a wasteful number, since it uses less digits than its factorization.

66562139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358425 (or 1358418 counting only the distinct ones).

The product of its digits is 58320, while the sum is 38.

The square root of 66562139 is about 8158.5623120744. The cubic root of 66562139 is about 405.2681027235.

The spelling of 66562139 in words is "sixty-six million, five hundred sixty-two thousand, one hundred thirty-nine".