663944398 has 16 divisors (see below), whose sum is σ = 1128975120. Its totient is φ = 290307456.

The previous prime is 663944377. The next prime is 663944399. The reversal of 663944398 is 893449366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663944399) 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, 671515 + ... + 672502.

It is an arithmetic number, because the mean of its divisors is an integer number (70560945).

Almost surely, 2^663944398 is an apocalyptic number.

663944398 is a deficient number, since it is larger than the sum of its proper divisors (465030722).

663944398 is a wasteful number, since it uses less digits than its factorization.

663944398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344051.

The product of its digits is 3359232, while the sum is 52.

The square root of 663944398 is about 25767.1185428251. The cubic root of 663944398 is about 872.3897822203.

The spelling of 663944398 in words is "six hundred sixty-three million, nine hundred forty-four thousand, three hundred ninety-eight".