18161488769 has 2 divisors, whose sum is σ = 18161488770. Its totient is φ = 18161488768.

The previous prime is 18161488759. The next prime is 18161488811. The reversal of 18161488769 is 96788416181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13249161025 + 4912327744 = 115105^2 + 70088^2 .

It is an emirp because it is prime and its reverse (96788416181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18161488769 - 2¹² = 18161484673 is a prime.

It is a super-2 number, since 2×18161488769² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18161488759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9080744384 + 9080744385.

It is an arithmetic number, because the mean of its divisors is an integer number (9080744385).

Almost surely, 2^18161488769 is an apocalyptic number.

It is an amenable number.

18161488769 is a deficient number, since it is larger than the sum of its proper divisors (1).

18161488769 is an equidigital number, since it uses as much as digits as its factorization.

18161488769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 59.

The spelling of 18161488769 in words is "eighteen billion, one hundred sixty-one million, four hundred eighty-eight thousand, seven hundred sixty-nine".