18680617 has 2 divisors, whose sum is σ = 18680618. Its totient is φ = 18680616.

The previous prime is 18680609. The next prime is 18680621. The reversal of 18680617 is 71608681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15280281 + 3400336 = 3909^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 18680617 - 2³ = 18680609 is a prime.

It is not a weakly prime, because it can be changed into another prime (18680687) 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, 9340308 + 9340309.

It is an arithmetic number, because the mean of its divisors is an integer number (9340309).

Almost surely, 2^18680617 is an apocalyptic number.

It is an amenable number.

18680617 is a deficient number, since it is larger than the sum of its proper divisors (1).

18680617 is an equidigital number, since it uses as much as digits as its factorization.

18680617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18680617 is about 4322.1079347929. The cubic root of 18680617 is about 265.3365464218.

The spelling of 18680617 in words is "eighteen million, six hundred eighty thousand, six hundred seventeen".