663605055 has 28 divisors (see below), whose sum is σ = 1193949480. Its totient is φ = 353920752.

The previous prime is 663605029. The next prime is 663605071. The reversal of 663605055 is 550506366.

It is a happy number.

It is not a de Polignac number, because 663605055 - 2⁵ = 663605023 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 87385 + ... + 94674.

Almost surely, 2^663605055 is an apocalyptic number.

663605055 is a deficient number, since it is larger than the sum of its proper divisors (530344425).

663605055 is an equidigital number, since it uses as much as digits as its factorization.

663605055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182082 (or 182067 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 663605055 is about 25760.5328943328. The cubic root of 663605055 is about 872.2411303069.

The spelling of 663605055 in words is "six hundred sixty-three million, six hundred five thousand, fifty-five".