663873085438 has 16 divisors (see below), whose sum is σ = 1010912194944. Its totient is φ = 326904704280.

The previous prime is 663873085397. The next prime is 663873085481. The reversal of 663873085438 is 834580378366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18520 + ... + 1152427.

It is an arithmetic number, because the mean of its divisors is an integer number (63182012184).

Almost surely, 2^663873085438 is an apocalyptic number.

663873085438 is a deficient number, since it is larger than the sum of its proper divisors (347039109506).

663873085438 is a wasteful number, since it uses less digits than its factorization.

663873085438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175247.

The product of its (nonzero) digits is 69672960, while the sum is 61.

The spelling of 663873085438 in words is "six hundred sixty-three billion, eight hundred seventy-three million, eighty-five thousand, four hundred thirty-eight".