18665719057 has 2 divisors, whose sum is σ = 18665719058. Its totient is φ = 18665719056.

The previous prime is 18665719003. The next prime is 18665719063. The reversal of 18665719057 is 75091756681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18618329601 + 47389456 = 136449^2 + 6884^2 .

It is a cyclic number.

It is not a de Polignac number, because 18665719057 - 2¹¹ = 18665717009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18665718989 and 18665719007.

It is not a weakly prime, because it can be changed into another prime (18665719067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332859528 + 9332859529.

It is an arithmetic number, because the mean of its divisors is an integer number (9332859529).

Almost surely, 2^18665719057 is an apocalyptic number.

It is an amenable number.

18665719057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18665719057 is an equidigital number, since it uses as much as digits as its factorization.

18665719057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 18665719057 in words is "eighteen billion, six hundred sixty-five million, seven hundred nineteen thousand, fifty-seven".