18735634943 has 4 divisors (see below), whose sum is σ = 18735931728. Its totient is φ = 18735338160.

The previous prime is 18735634913. The next prime is 18735634979. The reversal of 18735634943 is 34943653781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18735634943 - 2¹⁶ = 18735569407 is a prime.

It is a super-2 number, since 2×18735634943² (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 (18735634913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11771 + ... + 193932.

It is an arithmetic number, because the mean of its divisors is an integer number (4683982932).

Almost surely, 2^18735634943 is an apocalyptic number.

18735634943 is a deficient number, since it is larger than the sum of its proper divisors (296785).

18735634943 is an equidigital number, since it uses as much as digits as its factorization.

18735634943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296784.

The product of its digits is 6531840, while the sum is 53.

The spelling of 18735634943 in words is "eighteen billion, seven hundred thirty-five million, six hundred thirty-four thousand, nine hundred forty-three".