663255440 has 40 divisors (see below), whose sum is σ = 1567360248. Its totient is φ = 260951040.

The previous prime is 663255431. The next prime is 663255457. The reversal of 663255440 is 44552366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16875664 + 646379776 = 4108^2 + 25424^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 663255440.

It is an unprimeable number.

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, 63077 + ... + 72836.

Almost surely, 2^663255440 is an apocalyptic number.

It is an amenable number.

663255440 is an abundant number, since it is smaller than the sum of its proper divisors (904104808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663255440 is a wasteful number, since it uses less digits than its factorization.

663255440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135987 (or 135981 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 663255440 is about 25753.7461352713. The cubic root of 663255440 is about 872.0879256513.

The spelling of 663255440 in words is "six hundred sixty-three million, two hundred fifty-five thousand, four hundred forty".