66431023 has 2 divisors, whose sum is σ = 66431024. Its totient is φ = 66431022.

The previous prime is 66431009. The next prime is 66431039. The reversal of 66431023 is 32013466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66431023 - 2¹⁷ = 66299951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66431003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33215511 + 33215512.

It is an arithmetic number, because the mean of its divisors is an integer number (33215512).

Almost surely, 2^66431023 is an apocalyptic number.

66431023 is a deficient number, since it is larger than the sum of its proper divisors (1).

66431023 is an equidigital number, since it uses as much as digits as its factorization.

66431023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 66431023 is about 8150.5228666632. The cubic root of 66431023 is about 405.0018249168.

Adding to 66431023 its reverse (32013466), we get a palindrome (98444489).

The spelling of 66431023 in words is "sixty-six million, four hundred thirty-one thousand, twenty-three".