18735499943 has 16 divisors (see below), whose sum is σ = 19303764480. Its totient is φ = 18173690304.

The previous prime is 18735499921. The next prime is 18735499999. The reversal of 18735499943 is 34999453781.

It is a cyclic number.

It is not a de Polignac number, because 18735499943 - 2³² = 14440532647 is a prime.

It is a super-2 number, since 2×18735499943² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18735499903) 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 15 ways as a sum of consecutive naturals, for example, 4195730 + ... + 4200192.

It is an arithmetic number, because the mean of its divisors is an integer number (1206485280).

Almost surely, 2^18735499943 is an apocalyptic number.

18735499943 is a deficient number, since it is larger than the sum of its proper divisors (568264537).

18735499943 is a wasteful number, since it uses less digits than its factorization.

18735499943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158.

The product of its digits is 29393280, while the sum is 62.

The spelling of 18735499943 in words is "eighteen billion, seven hundred thirty-five million, four hundred ninety-nine thousand, nine hundred forty-three".