18281853697 has 4 divisors (see below), whose sum is σ = 18286962516. Its totient is φ = 18276744880.

The previous prime is 18281853691. The next prime is 18281853701. The reversal of 18281853697 is 79635818281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79635818281 = 37 ⋅2152319413.

It can be written as a sum of positive squares in 2 ways, for example, as 11705292481 + 6576561216 = 108191^2 + 81096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18281853697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18281853691) 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, 2549038 + ... + 2556199.

It is an arithmetic number, because the mean of its divisors is an integer number (4571740629).

Almost surely, 2^18281853697 is an apocalyptic number.

It is an amenable number.

18281853697 is a deficient number, since it is larger than the sum of its proper divisors (5108819).

18281853697 is an equidigital number, since it uses as much as digits as its factorization.

18281853697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108818.

The product of its digits is 5806080, while the sum is 58.

The spelling of 18281853697 in words is "eighteen billion, two hundred eighty-one million, eight hundred fifty-three thousand, six hundred ninety-seven".