664430287 has 2 divisors, whose sum is σ = 664430288. Its totient is φ = 664430286.

The previous prime is 664430243. The next prime is 664430293. The reversal of 664430287 is 782034466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664430287 - 2²⁷ = 530212559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664430387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332215143 + 332215144.

It is an arithmetic number, because the mean of its divisors is an integer number (332215144).

Almost surely, 2^664430287 is an apocalyptic number.

664430287 is a deficient number, since it is larger than the sum of its proper divisors (1).

664430287 is an equidigital number, since it uses as much as digits as its factorization.

664430287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 664430287 is about 25776.5452883042. The cubic root of 664430287 is about 872.6025416218.

The spelling of 664430287 in words is "six hundred sixty-four million, four hundred thirty thousand, two hundred eighty-seven".