18236743885 has 8 divisors (see below), whose sum is σ = 21885648120. Its totient is φ = 14588358144.

The previous prime is 18236743883. The next prime is 18236743939. The reversal of 18236743885 is 58834763281.

It can be written as a sum of positive squares in 4 ways, for example, as 352763524 + 17883980361 = 18782^2 + 133731^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18236743885 - 2¹ = 18236743883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236743883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47512 + ... + 196801.

It is an arithmetic number, because the mean of its divisors is an integer number (2735706015).

Almost surely, 2^18236743885 is an apocalyptic number.

It is an amenable number.

18236743885 is a deficient number, since it is larger than the sum of its proper divisors (3648904235).

18236743885 is a wasteful number, since it uses less digits than its factorization.

18236743885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259247.

The product of its digits is 7741440, while the sum is 55.

The spelling of 18236743885 in words is "eighteen billion, two hundred thirty-six million, seven hundred forty-three thousand, eight hundred eighty-five".