18938446623 has 40 divisors (see below), whose sum is σ = 29245556736. Its totient is φ = 12200706000.

The previous prime is 18938446603. The next prime is 18938446687. The reversal of 18938446623 is 32664483981.

18938446623 is a `hidden beast` number, since 1 + 8 + 9 + 3 + 8 + 4 + 4 + 6 + 623 = 666.

It is not a de Polignac number, because 18938446623 - 2⁸ = 18938446367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18938446623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938446603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1860598 + ... + 1870748.

Almost surely, 2^18938446623 is an apocalyptic number.

18938446623 is a deficient number, since it is larger than the sum of its proper divisors (10307110113).

18938446623 is a wasteful number, since it uses less digits than its factorization.

18938446623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10937 (or 10928 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The spelling of 18938446623 in words is "eighteen billion, nine hundred thirty-eight million, four hundred forty-six thousand, six hundred twenty-three".