664317733 has 2 divisors, whose sum is σ = 664317734. Its totient is φ = 664317732.

The previous prime is 664317727. The next prime is 664317781. The reversal of 664317733 is 337713466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358837249 + 305480484 = 18943^2 + 17478^2 .

It is a cyclic number.

It is not a de Polignac number, because 664317733 - 2¹⁷ = 664186661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664317133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332158866 + 332158867.

It is an arithmetic number, because the mean of its divisors is an integer number (332158867).

Almost surely, 2^664317733 is an apocalyptic number.

It is an amenable number.

664317733 is a deficient number, since it is larger than the sum of its proper divisors (1).

664317733 is an equidigital number, since it uses as much as digits as its factorization.

664317733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 40.

The square root of 664317733 is about 25774.3619319664. The cubic root of 664317733 is about 872.5532660972.

The spelling of 664317733 in words is "six hundred sixty-four million, three hundred seventeen thousand, seven hundred thirty-three".