18937509436 has 12 divisors (see below), whose sum is σ = 33307178800. Its totient is φ = 9421172640.

The previous prime is 18937509391. The next prime is 18937509439. The reversal of 18937509436 is 63490573981.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18937509439) 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 3 ways as a sum of consecutive naturals, for example, 11894625 + ... + 11896216.

Almost surely, 2^18937509436 is an apocalyptic number.

It is an amenable number.

18937509436 is a deficient number, since it is larger than the sum of its proper divisors (14369669364).

18937509436 is a wasteful number, since it uses less digits than its factorization.

18937509436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23791044 (or 23791042 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 18937509436 in words is "eighteen billion, nine hundred thirty-seven million, five hundred nine thousand, four hundred thirty-six".