18783260161 has 4 divisors (see below), whose sum is σ = 18783540052. Its totient is φ = 18782980272.

The previous prime is 18783260143. The next prime is 18783260219. The reversal of 18783260161 is 16106238781.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13787456400 + 4995803761 = 117420^2 + 70681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18783260161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18783264161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27511 + ... + 195763.

It is an arithmetic number, because the mean of its divisors is an integer number (4695885013).

Almost surely, 2^18783260161 is an apocalyptic number.

It is an amenable number.

18783260161 is a deficient number, since it is larger than the sum of its proper divisors (279891).

18783260161 is a wasteful number, since it uses less digits than its factorization.

18783260161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279890.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 18783260161 in words is "eighteen billion, seven hundred eighty-three million, two hundred sixty thousand, one hundred sixty-one".