664462291 has 2 divisors, whose sum is σ = 664462292. Its totient is φ = 664462290.

The previous prime is 664462283. The next prime is 664462321. The reversal of 664462291 is 192264466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664462291 - 2³ = 664462283 is a prime.

It is not a weakly prime, because it can be changed into another prime (664462231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332231145 + 332231146.

It is an arithmetic number, because the mean of its divisors is an integer number (332231146).

Almost surely, 2^664462291 is an apocalyptic number.

664462291 is a deficient number, since it is larger than the sum of its proper divisors (1).

664462291 is an equidigital number, since it uses as much as digits as its factorization.

664462291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 40.

The square root of 664462291 is about 25777.1660777518. The cubic root of 664462291 is about 872.6165517816.

The spelling of 664462291 in words is "six hundred sixty-four million, four hundred sixty-two thousand, two hundred ninety-one".