664266293 has 2 divisors, whose sum is σ = 664266294. Its totient is φ = 664266292.

The previous prime is 664266227. The next prime is 664266299. The reversal of 664266293 is 392662466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445758769 + 218507524 = 21113^2 + 14782^2 .

It is a cyclic number.

It is not a de Polignac number, because 664266293 - 2⁸ = 664266037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664266299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332133146 + 332133147.

It is an arithmetic number, because the mean of its divisors is an integer number (332133147).

Almost surely, 2^664266293 is an apocalyptic number.

It is an amenable number.

664266293 is a deficient number, since it is larger than the sum of its proper divisors (1).

664266293 is an equidigital number, since it uses as much as digits as its factorization.

664266293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 44.

The square root of 664266293 is about 25773.3640217958. The cubic root of 664266293 is about 872.5307440939.

The spelling of 664266293 in words is "six hundred sixty-four million, two hundred sixty-six thousand, two hundred ninety-three".