18256893553 has 4 divisors (see below), whose sum is σ = 18261105520. Its totient is φ = 18252681588.

The previous prime is 18256893541. The next prime is 18256893569. The reversal of 18256893553 is 35539865281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35539865281 = 89 ⋅399324329.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18256893553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18256893494 and 18256893503.

It is not an unprimeable number, because it can be changed into a prime (18256893503) 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, 2099475 + ... + 2108152.

It is an arithmetic number, because the mean of its divisors is an integer number (4565276380).

Almost surely, 2^18256893553 is an apocalyptic number.

It is an amenable number.

18256893553 is a deficient number, since it is larger than the sum of its proper divisors (4211967).

18256893553 is an equidigital number, since it uses as much as digits as its factorization.

18256893553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211966.

The product of its digits is 7776000, while the sum is 55.

The spelling of 18256893553 in words is "eighteen billion, two hundred fifty-six million, eight hundred ninety-three thousand, five hundred fifty-three".