18554012861 has 2 divisors, whose sum is σ = 18554012862. Its totient is φ = 18554012860.

The previous prime is 18554012831. The next prime is 18554012909. The reversal of 18554012861 is 16821045581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16659064900 + 1894947961 = 129070^2 + 43531^2 .

It is an emirp because it is prime and its reverse (16821045581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18554012861 - 2²² = 18549818557 is a prime.

It is a super-3 number, since 3×18554012861³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18554012801) 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, 9277006430 + 9277006431.

It is an arithmetic number, because the mean of its divisors is an integer number (9277006431).

Almost surely, 2^18554012861 is an apocalyptic number.

It is an amenable number.

18554012861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18554012861 is an equidigital number, since it uses as much as digits as its factorization.

18554012861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 41.

The spelling of 18554012861 in words is "eighteen billion, five hundred fifty-four million, twelve thousand, eight hundred sixty-one".