18253649843 has 8 divisors (see below), whose sum is σ = 21444847536. Its totient is φ = 15317748000.

The previous prime is 18253649801. The next prime is 18253649851. The reversal of 18253649843 is 34894635281.

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 18253649843 - 2¹⁸ = 18253387699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18253349843) 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, 63823808 + ... + 63824093.

It is an arithmetic number, because the mean of its divisors is an integer number (2680605942).

Almost surely, 2^18253649843 is an apocalyptic number.

18253649843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18253649843 is a deficient number, since it is larger than the sum of its proper divisors (3191197693).

18253649843 is a wasteful number, since it uses less digits than its factorization.

18253649843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127647925.

The product of its digits is 4976640, while the sum is 53.

The spelling of 18253649843 in words is "eighteen billion, two hundred fifty-three million, six hundred forty-nine thousand, eight hundred forty-three".