18001291217 has 16 divisors (see below), whose sum is σ = 22254812160. Its totient is φ = 14178894912.

The previous prime is 18001291213. The next prime is 18001291289. The reversal of 18001291217 is 71219210081.

It is not a de Polignac number, because 18001291217 - 2² = 18001291213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18001291213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423242 + ... + 463827.

It is an arithmetic number, because the mean of its divisors is an integer number (1390925760).

Almost surely, 2^18001291217 is an apocalyptic number.

It is an amenable number.

18001291217 is a deficient number, since it is larger than the sum of its proper divisors (4253520943).

18001291217 is a wasteful number, since it uses less digits than its factorization.

18001291217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887312.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 18001291217 in words is "eighteen billion, one million, two hundred ninety-one thousand, two hundred seventeen".