18260862881 has 2 divisors, whose sum is σ = 18260862882. Its totient is φ = 18260862880.

The previous prime is 18260862871. The next prime is 18260862937. The reversal of 18260862881 is 18826806281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17913413281 + 347449600 = 133841^2 + 18640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18260862881 is a prime.

It is a super-2 number, since 2×18260862881² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18260862871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9130431440 + 9130431441.

It is an arithmetic number, because the mean of its divisors is an integer number (9130431441).

Almost surely, 2^18260862881 is an apocalyptic number.

It is an amenable number.

18260862881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18260862881 is an equidigital number, since it uses as much as digits as its factorization.

18260862881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 589824, while the sum is 50.

The spelling of 18260862881 in words is "eighteen billion, two hundred sixty million, eight hundred sixty-two thousand, eight hundred eighty-one".