663664907 has 2 divisors, whose sum is σ = 663664908. Its totient is φ = 663664906.

The previous prime is 663664891. The next prime is 663664961. The reversal of 663664907 is 709466366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663664907 - 2⁴ = 663664891 is a prime.

It is a super-2 number, since 2×663664907² = 880902217566637298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (663664987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331832453 + 331832454.

It is an arithmetic number, because the mean of its divisors is an integer number (331832454).

Almost surely, 2^663664907 is an apocalyptic number.

663664907 is a deficient number, since it is larger than the sum of its proper divisors (1).

663664907 is an equidigital number, since it uses as much as digits as its factorization.

663664907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 47.

The square root of 663664907 is about 25761.6945677104. The cubic root of 663664907 is about 872.2673526341.

The spelling of 663664907 in words is "six hundred sixty-three million, six hundred sixty-four thousand, nine hundred seven".