18446027881 has 2 divisors, whose sum is σ = 18446027882. Its totient is φ = 18446027880.

The previous prime is 18446027869. The next prime is 18446027891. The reversal of 18446027881 is 18872064481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18445985856 + 42025 = 135816^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 18446027881 - 2¹¹ = 18446025833 is a prime.

It is a super-2 number, since 2×18446027881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18446027851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9223013940 + 9223013941.

It is an arithmetic number, because the mean of its divisors is an integer number (9223013941).

Almost surely, 2^18446027881 is an apocalyptic number.

It is an amenable number.

18446027881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18446027881 is an equidigital number, since it uses as much as digits as its factorization.

18446027881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 688128, while the sum is 49.

The spelling of 18446027881 in words is "eighteen billion, four hundred forty-six million, twenty-seven thousand, eight hundred eighty-one".