663638701 has 16 divisors (see below), whose sum is σ = 734469120. Its totient is φ = 594595120.

The previous prime is 663638671. The next prime is 663638713. The reversal of 663638701 is 107836366.

It is a cyclic number.

It is not a de Polignac number, because 663638701 - 2⁹ = 663638189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663638791) 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, 601116 + ... + 602218.

It is an arithmetic number, because the mean of its divisors is an integer number (45904320).

Almost surely, 2^663638701 is an apocalyptic number.

It is an amenable number.

663638701 is a deficient number, since it is larger than the sum of its proper divisors (70830419).

663638701 is a wasteful number, since it uses less digits than its factorization.

663638701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 663638701 is about 25761.1859393158. The cubic root of 663638701 is about 872.2558714690.

The spelling of 663638701 in words is "six hundred sixty-three million, six hundred thirty-eight thousand, seven hundred one".