18007447708165 has 8 divisors (see below), whose sum is σ = 22016653047288. Its totient is φ = 14134147634880.

The previous prime is 18007447708157. The next prime is 18007447708177. The reversal of 18007447708165 is 56180774470081.

It can be written as a sum of positive squares in 4 ways, for example, as 8685038867521 + 9322408840644 = 2947039^2 + 3053262^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18007447708165 - 2³ = 18007447708157 is a prime.

It is a super-2 number, since 2×18007447708165² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33976316166 + ... + 33976316695.

It is an arithmetic number, because the mean of its divisors is an integer number (2752081630911).

Almost surely, 2^{18007447708165} is an apocalyptic number.

It is an amenable number.

18007447708165 is a deficient number, since it is larger than the sum of its proper divisors (4009205339123).

18007447708165 is an equidigital number, since it uses as much as digits as its factorization.

18007447708165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67952632919.

The product of its (nonzero) digits is 10536960, while the sum is 58.

The spelling of 18007447708165 in words is "eighteen trillion, seven billion, four hundred forty-seven million, seven hundred eight thousand, one hundred sixty-five".