66822431 has 12 divisors (see below), whose sum is σ = 73390320. Its totient is φ = 60802560.

The previous prime is 66822421. The next prime is 66822433. The reversal of 66822431 is 13422866.

It is a de Polignac number, because none of the positive numbers 2^k-66822431 is a prime.

It is a super-2 number, since 2×66822431² = 8930474569499522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66822433) 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 11 ways as a sum of consecutive naturals, for example, 9215 + ... + 14783.

It is an arithmetic number, because the mean of its divisors is an integer number (6115860).

Almost surely, 2^66822431 is an apocalyptic number.

66822431 is a deficient number, since it is larger than the sum of its proper divisors (6567889).

66822431 is a wasteful number, since it uses less digits than its factorization.

66822431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5666 (or 5653 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 66822431 is about 8174.4988225579. The cubic root of 66822431 is about 405.7956841207.

The spelling of 66822431 in words is "sixty-six million, eight hundred twenty-two thousand, four hundred thirty-one".