66431039 has 2 divisors, whose sum is σ = 66431040. Its totient is φ = 66431038.

The previous prime is 66431023. The next prime is 66431051. The reversal of 66431039 is 93013466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66431039 - 2⁴ = 66431023 is a prime.

It is a Chen prime.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 66430996 and 66431014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66431009) 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 as a sum of consecutive naturals, namely, 33215519 + 33215520.

It is an arithmetic number, because the mean of its divisors is an integer number (33215520).

Almost surely, 2^66431039 is an apocalyptic number.

66431039 is a deficient number, since it is larger than the sum of its proper divisors (1).

66431039 is an equidigital number, since it uses as much as digits as its factorization.

66431039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 66431039 is about 8150.5238481953. The cubic root of 66431039 is about 405.0018574319.

The spelling of 66431039 in words is "sixty-six million, four hundred thirty-one thousand, thirty-nine".