663864604678 has 64 divisors (see below), whose sum is σ = 1115292271104. Its totient is φ = 293849920000.

The previous prime is 663864604597. The next prime is 663864604703. The reversal of 663864604678 is 876406468366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32882175 + ... + 32902357.

It is an arithmetic number, because the mean of its divisors is an integer number (17426441736).

Almost surely, 2^663864604678 is an apocalyptic number.

663864604678 is a deficient number, since it is larger than the sum of its proper divisors (451427666426).

663864604678 is a wasteful number, since it uses less digits than its factorization.

663864604678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20541.

The product of its (nonzero) digits is 167215104, while the sum is 64.

The spelling of 663864604678 in words is "six hundred sixty-three billion, eight hundred sixty-four million, six hundred four thousand, six hundred seventy-eight".