66657023 has 2 divisors, whose sum is σ = 66657024. Its totient is φ = 66657022.

The previous prime is 66656999. The next prime is 66657029. The reversal of 66657023 is 32075666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66657023 - 2⁸ = 66656767 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66657029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33328511 + 33328512.

It is an arithmetic number, because the mean of its divisors is an integer number (33328512).

Almost surely, 2^66657023 is an apocalyptic number.

66657023 is a deficient number, since it is larger than the sum of its proper divisors (1).

66657023 is an equidigital number, since it uses as much as digits as its factorization.

66657023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 66657023 is about 8164.3752363546. The cubic root of 66657023 is about 405.4605805192.

The spelling of 66657023 in words is "sixty-six million, six hundred fifty-seven thousand, twenty-three".