18217396361 has 16 divisors (see below), whose sum is σ = 18590799888. Its totient is φ = 17848320000.

The previous prime is 18217396343. The next prime is 18217396363. The reversal of 18217396361 is 16369371281.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4753275136 + 13464121225 = 68944^2 + 116035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18217396361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18217396363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11377961 + ... + 11379561.

It is an arithmetic number, because the mean of its divisors is an integer number (1161924993).

Almost surely, 2^18217396361 is an apocalyptic number.

It is an amenable number.

18217396361 is a deficient number, since it is larger than the sum of its proper divisors (373403527).

18217396361 is a wasteful number, since it uses less digits than its factorization.

18217396361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812.

The product of its digits is 326592, while the sum is 47.

The spelling of 18217396361 in words is "eighteen billion, two hundred seventeen million, three hundred ninety-six thousand, three hundred sixty-one".