663997498 has 8 divisors (see below), whose sum is σ = 997200180. Its totient is φ = 331597440.

The previous prime is 663997493. The next prime is 663997513. The reversal of 663997498 is 894799366.

It can be written as a sum of positive squares in 2 ways, for example, as 637916049 + 26081449 = 25257^2 + 5107^2 .

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

It is not an unprimeable number, because it can be changed into a prime (663997493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198583 + ... + 201898.

Almost surely, 2^663997498 is an apocalyptic number.

663997498 is a deficient number, since it is larger than the sum of its proper divisors (333202682).

663997498 is a wasteful number, since it uses less digits than its factorization.

663997498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401312.

The product of its digits is 17635968, while the sum is 61.

The square root of 663997498 is about 25768.1489051891. The cubic root of 663997498 is about 872.4130385164.

The spelling of 663997498 in words is "six hundred sixty-three million, nine hundred ninety-seven thousand, four hundred ninety-eight".