18204869873 has 2 divisors, whose sum is σ = 18204869874. Its totient is φ = 18204869872.

The previous prime is 18204869869. The next prime is 18204869927. The reversal of 18204869873 is 37896840281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10215549184 + 7989320689 = 101072^2 + 89383^2 .

It is a cyclic number.

It is not a de Polignac number, because 18204869873 - 2² = 18204869869 is a prime.

It is a super-2 number, since 2×18204869873² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18204869803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9102434936 + 9102434937.

It is an arithmetic number, because the mean of its divisors is an integer number (9102434937).

Almost surely, 2^18204869873 is an apocalyptic number.

It is an amenable number.

18204869873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18204869873 is an equidigital number, since it uses as much as digits as its factorization.

18204869873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 18204869873 in words is "eighteen billion, two hundred four million, eight hundred sixty-nine thousand, eight hundred seventy-three".