18580669 has 2 divisors, whose sum is σ = 18580670. Its totient is φ = 18580668.

The previous prime is 18580663. The next prime is 18580691. The reversal of 18580669 is 96608581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18164644 + 416025 = 4262^2 + 645^2 .

It is an emirp because it is prime and its reverse (96608581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18580669 - 2¹¹ = 18578621 is a prime.

It is a super-2 number, since 2×18580669² = 690482520975122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18580663) 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, 9290334 + 9290335.

It is an arithmetic number, because the mean of its divisors is an integer number (9290335).

Almost surely, 2^18580669 is an apocalyptic number.

It is an amenable number.

18580669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18580669 is an equidigital number, since it uses as much as digits as its factorization.

18580669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 18580669 is about 4310.5300138150. The cubic root of 18580669 is about 264.8624847219.

The spelling of 18580669 in words is "eighteen million, five hundred eighty thousand, six hundred sixty-nine".