663498655 has 16 divisors (see below), whose sum is σ = 811560960. Its totient is φ = 520625952.

The previous prime is 663498637. The next prime is 663498683. The reversal of 663498655 is 556894366.

It is a cyclic number.

It is not a de Polignac number, because 663498655 - 2¹¹ = 663496607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75922 + ... + 84208.

It is an arithmetic number, because the mean of its divisors is an integer number (50722560).

Almost surely, 2^663498655 is an apocalyptic number.

663498655 is a deficient number, since it is larger than the sum of its proper divisors (148062305).

663498655 is a wasteful number, since it uses less digits than its factorization.

663498655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8598.

The product of its digits is 4665600, while the sum is 52.

The square root of 663498655 is about 25758.4676368762. The cubic root of 663498655 is about 872.1945105008.

The spelling of 663498655 in words is "six hundred sixty-three million, four hundred ninety-eight thousand, six hundred fifty-five".