663307917 has 16 divisors (see below), whose sum is σ = 956122560. Its totient is φ = 407607552.

The previous prime is 663307907. The next prime is 663307943. The reversal of 663307917 is 719703366.

It is not a de Polignac number, because 663307917 - 2⁴ = 663307901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663307907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155148 + ... + 159365.

It is an arithmetic number, because the mean of its divisors is an integer number (59757660).

Almost surely, 2^663307917 is an apocalyptic number.

It is an amenable number.

663307917 is a deficient number, since it is larger than the sum of its proper divisors (292814643).

663307917 is a wasteful number, since it uses less digits than its factorization.

663307917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314572.

The product of its (nonzero) digits is 142884, while the sum is 42.

The square root of 663307917 is about 25754.7649377741. The cubic root of 663307917 is about 872.1109250109.

It can be divided in two parts, 66330 and 7917, that added together give a palindrome (74247).

The spelling of 663307917 in words is "six hundred sixty-three million, three hundred seven thousand, nine hundred seventeen".