664232047 has 2 divisors, whose sum is σ = 664232048. Its totient is φ = 664232046.

The previous prime is 664232027. The next prime is 664232053. The reversal of 664232047 is 740232466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664232047 - 2²⁷ = 530014319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664232027) 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, 332116023 + 332116024.

It is an arithmetic number, because the mean of its divisors is an integer number (332116024).

Almost surely, 2^664232047 is an apocalyptic number.

664232047 is a deficient number, since it is larger than the sum of its proper divisors (1).

664232047 is an equidigital number, since it uses as much as digits as its factorization.

664232047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 664232047 is about 25772.6996451672. The cubic root of 664232047 is about 872.5157495043.

The spelling of 664232047 in words is "six hundred sixty-four million, two hundred thirty-two thousand, forty-seven".