664666463 has 2 divisors, whose sum is σ = 664666464. Its totient is φ = 664666462.

The previous prime is 664666423. The next prime is 664666477. The reversal of 664666463 is 364666466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664666463 - 2²⁸ = 396231007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664666423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332333231 + 332333232.

It is an arithmetic number, because the mean of its divisors is an integer number (332333232).

Almost surely, 2^664666463 is an apocalyptic number.

664666463 is a deficient number, since it is larger than the sum of its proper divisors (1).

664666463 is an equidigital number, since it uses as much as digits as its factorization.

664666463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 47.

The square root of 664666463 is about 25781.1261003083. The cubic root of 664666463 is about 872.7059200942.

The spelling of 664666463 in words is "six hundred sixty-four million, six hundred sixty-six thousand, four hundred sixty-three".