663690503 has 8 divisors (see below), whose sum is σ = 758668800. Its totient is φ = 568753560.

The previous prime is 663690499. The next prime is 663690527. The reversal of 663690503 is 305096366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663690503 - 2² = 663690499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663690403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41198 + ... + 54996.

It is an arithmetic number, because the mean of its divisors is an integer number (94833600).

Almost surely, 2^663690503 is an apocalyptic number.

663690503 is a deficient number, since it is larger than the sum of its proper divisors (94978297).

663690503 is a wasteful number, since it uses less digits than its factorization.

663690503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20677.

The product of its (nonzero) digits is 87480, while the sum is 38.

The square root of 663690503 is about 25762.1913470108. The cubic root of 663690503 is about 872.2785662591.

The spelling of 663690503 in words is "six hundred sixty-three million, six hundred ninety thousand, five hundred three".