18638828213536 has 24 divisors (see below), whose sum is σ = 36897928930044. Its totient is φ = 9267925628160.

The previous prime is 18638828213513. The next prime is 18638828213611. The reversal of 18638828213536 is 63531282883681.

It can be written as a sum of positive squares in 2 ways, for example, as 18404614803600 + 234213409936 = 4290060^2 + 483956^2 .

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 3 ways as a sum of consecutive naturals, for example, 1609009075 + ... + 1609020658.

Almost surely, 2^{18638828213536} is an apocalyptic number.

18638828213536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18638828213536 is a deficient number, since it is larger than the sum of its proper divisors (18259100716508).

18638828213536 is a wasteful number, since it uses less digits than its factorization.

18638828213536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218029924 (or 3218029916 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 64.

The spelling of 18638828213536 in words is "eighteen trillion, six hundred thirty-eight billion, eight hundred twenty-eight million, two hundred thirteen thousand, five hundred thirty-six".