18270867665 has 4 divisors (see below), whose sum is σ = 21925041204. Its totient is φ = 14616694128.

The previous prime is 18270867619. The next prime is 18270867683. The reversal of 18270867665 is 56676807281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56676807281 = 109 ⋅519970709.

It can be written as a sum of positive squares in 2 ways, for example, as 14311815424 + 3959052241 = 119632^2 + 62921^2 .

It is a cyclic number.

It is not a de Polignac number, because 18270867665 - 2²² = 18266673361 is a prime.

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 18270867665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1827086762 + ... + 1827086771.

It is an arithmetic number, because the mean of its divisors is an integer number (5481260301).

Almost surely, 2^18270867665 is an apocalyptic number.

It is an amenable number.

18270867665 is a deficient number, since it is larger than the sum of its proper divisors (3654173539).

18270867665 is an equidigital number, since it uses as much as digits as its factorization.

18270867665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654173538.

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 18270867665 in words is "eighteen billion, two hundred seventy million, eight hundred sixty-seven thousand, six hundred sixty-five".