18210818161 has 8 divisors (see below), whose sum is σ = 18282584448. Its totient is φ = 18139086000.

The previous prime is 18210818141. The next prime is 18210818189. The reversal of 18210818161 is 16181801281.

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

It is a cyclic number.

It is not a de Polignac number, because 18210818161 - 2²¹ = 18208721009 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 18210818161.

It is not an unprimeable number, because it can be changed into a prime (18210818111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778346 + ... + 1788556.

It is an arithmetic number, because the mean of its divisors is an integer number (2285323056).

Almost surely, 2^18210818161 is an apocalyptic number.

It is an amenable number.

18210818161 is a deficient number, since it is larger than the sum of its proper divisors (71766287).

18210818161 is a wasteful number, since it uses less digits than its factorization.

18210818161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17063.

The product of its (nonzero) digits is 6144, while the sum is 37.

The spelling of 18210818161 in words is "eighteen billion, two hundred ten million, eight hundred eighteen thousand, one hundred sixty-one".