638613623166 has 16 divisors (see below), whose sum is σ = 1277243007744. Its totient is φ = 212868580824.

The previous prime is 638613623147. The next prime is 638613623177. The reversal of 638613623166 is 661326316836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92740 + ... + 1133943.

It is an arithmetic number, because the mean of its divisors is an integer number (79827687984).

Almost surely, 2^638613623166 is an apocalyptic number.

638613623166 is an abundant number, since it is smaller than the sum of its proper divisors (638629384578).

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

638613623166 is a wasteful number, since it uses less digits than its factorization.

638613623166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313455.

The product of its digits is 3359232, while the sum is 51.

The spelling of 638613623166 in words is "six hundred thirty-eight billion, six hundred thirteen million, six hundred twenty-three thousand, one hundred sixty-six".