66164239 has 2 divisors, whose sum is σ = 66164240. Its totient is φ = 66164238.

The previous prime is 66164183. The next prime is 66164243. The reversal of 66164239 is 93246166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66164239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66164198 and 66164207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66164269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082119 + 33082120.

It is an arithmetic number, because the mean of its divisors is an integer number (33082120).

Almost surely, 2^66164239 is an apocalyptic number.

66164239 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164239 is an equidigital number, since it uses as much as digits as its factorization.

66164239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 66164239 is about 8134.1403356470. The cubic root of 66164239 is about 404.4589411647.

The spelling of 66164239 in words is "sixty-six million, one hundred sixty-four thousand, two hundred thirty-nine".