18198944253 has 24 divisors (see below), whose sum is σ = 30071724800. Its totient is φ = 10389350304.

The previous prime is 18198944243. The next prime is 18198944263. The reversal of 18198944253 is 35244989181.

It is a happy number.

18198944253 is a `hidden beast` number, since 1 + 8 + 198 + 9 + 442 + 5 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (18198944243) and next prime (18198944263).

It is not a de Polignac number, because 18198944253 - 2¹³ = 18198936061 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18198944253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198944243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73558 + ... + 204471.

Almost surely, 2^18198944253 is an apocalyptic number.

It is an amenable number.

18198944253 is a deficient number, since it is larger than the sum of its proper divisors (11872780547).

18198944253 is a wasteful number, since it uses less digits than its factorization.

18198944253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279081 (or 279078 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 18198944253 in words is "eighteen billion, one hundred ninety-eight million, nine hundred forty-four thousand, two hundred fifty-three".