18446027861 has 2 divisors, whose sum is σ = 18446027862. Its totient is φ = 18446027860.

The previous prime is 18446027851. The next prime is 18446027869. The reversal of 18446027861 is 16872064481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18277417636 + 168610225 = 135194^2 + 12985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18446027861 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18446027869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9223013930 + 9223013931.

It is an arithmetic number, because the mean of its divisors is an integer number (9223013931).

Almost surely, 2^18446027861 is an apocalyptic number.

It is an amenable number.

18446027861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18446027861 is an equidigital number, since it uses as much as digits as its factorization.

18446027861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 18446027861 in words is "eighteen billion, four hundred forty-six million, twenty-seven thousand, eight hundred sixty-one".