663307901 has 2 divisors, whose sum is σ = 663307902. Its totient is φ = 663307900.

The previous prime is 663307891. The next prime is 663307903. The reversal of 663307901 is 109703366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 618765625 + 44542276 = 24875^2 + 6674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663307901 is a prime.

Together with 663307903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663307903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331653950 + 331653951.

It is an arithmetic number, because the mean of its divisors is an integer number (331653951).

Almost surely, 2^663307901 is an apocalyptic number.

It is an amenable number.

663307901 is a deficient number, since it is larger than the sum of its proper divisors (1).

663307901 is an equidigital number, since it uses as much as digits as its factorization.

663307901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 663307901 is about 25754.7646271520. The cubic root of 663307901 is about 872.1109179987.

The spelling of 663307901 in words is "six hundred sixty-three million, three hundred seven thousand, nine hundred one".