663404894 has 16 divisors (see below), whose sum is σ = 1026008208. Its totient is φ = 321472512.

The previous prime is 663404891. The next prime is 663404897. The reversal of 663404894 is 498404366.

663404894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (663404891) and next prime (663404897).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663404891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577 + ... + 36459.

It is an arithmetic number, because the mean of its divisors is an integer number (64125513).

Almost surely, 2^663404894 is an apocalyptic number.

663404894 is a deficient number, since it is larger than the sum of its proper divisors (362603314).

663404894 is a wasteful number, since it uses less digits than its factorization.

663404894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35179.

The product of its (nonzero) digits is 497664, while the sum is 44.

The square root of 663404894 is about 25756.6475691228. The cubic root of 663404894 is about 872.1534244181.

The spelling of 663404894 in words is "six hundred sixty-three million, four hundred four thousand, eight hundred ninety-four".