18308007265 has 4 divisors (see below), whose sum is σ = 21969608724. Its totient is φ = 14646405808.

The previous prime is 18308007257. The next prime is 18308007281. The reversal of 18308007265 is 56270080381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56270080381 = 2531 ⋅22232351.

It can be written as a sum of positive squares in 2 ways, for example, as 9838854481 + 8469152784 = 99191^2 + 92028^2 .

It is a cyclic number.

It is not a de Polignac number, because 18308007265 - 2³ = 18308007257 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 1830800722 + ... + 1830800731.

It is an arithmetic number, because the mean of its divisors is an integer number (5492402181).

Almost surely, 2^18308007265 is an apocalyptic number.

It is an amenable number.

18308007265 is a deficient number, since it is larger than the sum of its proper divisors (3661601459).

18308007265 is an equidigital number, since it uses as much as digits as its factorization.

18308007265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661601458.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 18308007265 in words is "eighteen billion, three hundred eight million, seven thousand, two hundred sixty-five".