18250985761 has 2 divisors, whose sum is σ = 18250985762. Its totient is φ = 18250985760.

The previous prime is 18250985759. The next prime is 18250985807. The reversal of 18250985761 is 16758905281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18177780625 + 73205136 = 134825^2 + 8556^2 .

It is a cyclic number.

It is not a de Polignac number, because 18250985761 - 2¹ = 18250985759 is a prime.

Together with 18250985759, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18250985699 and 18250985708.

It is not a weakly prime, because it can be changed into another prime (18250985741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9125492880 + 9125492881.

It is an arithmetic number, because the mean of its divisors is an integer number (9125492881).

Almost surely, 2^18250985761 is an apocalyptic number.

It is an amenable number.

18250985761 is a deficient number, since it is larger than the sum of its proper divisors (1).

18250985761 is an equidigital number, since it uses as much as digits as its factorization.

18250985761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 18250985761 in words is "eighteen billion, two hundred fifty million, nine hundred eighty-five thousand, seven hundred sixty-one".