663794018 has 16 divisors (see below), whose sum is σ = 1030087800. Its totient is φ = 320592000.

The previous prime is 663794017. The next prime is 663794039. The reversal of 663794018 is 810497366.

It can be written as a sum of positive squares in 4 ways, for example, as 659821969 + 3972049 = 25687^2 + 1993^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 663794018.

It is not an unprimeable number, because it can be changed into a prime (663794011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31793 + ... + 48356.

Almost surely, 2^663794018 is an apocalyptic number.

663794018 is a deficient number, since it is larger than the sum of its proper divisors (366293782).

663794018 is a wasteful number, since it uses less digits than its factorization.

663794018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80293.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 663794018 is about 25764.2003174948. The cubic root of 663794018 is about 872.3239133104.

The spelling of 663794018 in words is "six hundred sixty-three million, seven hundred ninety-four thousand, eighteen".