18180953867 has 2 divisors, whose sum is σ = 18180953868. Its totient is φ = 18180953866.

The previous prime is 18180953863. The next prime is 18180953891. The reversal of 18180953867 is 76835908181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18180953867 - 2² = 18180953863 is a prime.

It is not a weakly prime, because it can be changed into another prime (18180953863) 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 as a sum of consecutive naturals, namely, 9090476933 + 9090476934.

It is an arithmetic number, because the mean of its divisors is an integer number (9090476934).

Almost surely, 2^18180953867 is an apocalyptic number.

18180953867 is a deficient number, since it is larger than the sum of its proper divisors (1).

18180953867 is an equidigital number, since it uses as much as digits as its factorization.

18180953867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 56.

The spelling of 18180953867 in words is "eighteen billion, one hundred eighty million, nine hundred fifty-three thousand, eight hundred sixty-seven".