18684261619 has 2 divisors, whose sum is σ = 18684261620. Its totient is φ = 18684261618.

The previous prime is 18684261593. The next prime is 18684261637. The reversal of 18684261619 is 91616248681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18684261619 - 2¹¹ = 18684259571 is a prime.

It is a super-2 number, since 2×18684261619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18684261019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342130809 + 9342130810.

It is an arithmetic number, because the mean of its divisors is an integer number (9342130810).

Almost surely, 2^18684261619 is an apocalyptic number.

18684261619 is a deficient number, since it is larger than the sum of its proper divisors (1).

18684261619 is an equidigital number, since it uses as much as digits as its factorization.

18684261619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 52.

The spelling of 18684261619 in words is "eighteen billion, six hundred eighty-four million, two hundred sixty-one thousand, six hundred nineteen".