18085440977 has 2 divisors, whose sum is σ = 18085440978. Its totient is φ = 18085440976.

The previous prime is 18085440959. The next prime is 18085441009. The reversal of 18085440977 is 77904458081.

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., 13106586256 + 4978854721 = 114484^2 + 70561^2 .

It is an emirp because it is prime and its reverse (77904458081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18085440977 - 2⁸ = 18085440721 is a prime.

It is not a weakly prime, because it can be changed into another prime (18085440077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9042720488 + 9042720489.

It is an arithmetic number, because the mean of its divisors is an integer number (9042720489).

Almost surely, 2^18085440977 is an apocalyptic number.

It is an amenable number.

18085440977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18085440977 is an equidigital number, since it uses as much as digits as its factorization.

18085440977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 18085440977 in words is "eighteen billion, eighty-five million, four hundred forty thousand, nine hundred seventy-seven".