18849886669 has 2 divisors, whose sum is σ = 18849886670. Its totient is φ = 18849886668.

The previous prime is 18849886621. The next prime is 18849886673. The reversal of 18849886669 is 96668894881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18840856644 + 9030025 = 137262^2 + 3005^2 .

It is a cyclic number.

It is not a de Polignac number, because 18849886669 - 2²³ = 18841498061 is a prime.

It is a super-2 number, since 2×18849886669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18849883669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9424943334 + 9424943335.

It is an arithmetic number, because the mean of its divisors is an integer number (9424943335).

Almost surely, 2^18849886669 is an apocalyptic number.

It is an amenable number.

18849886669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18849886669 is an equidigital number, since it uses as much as digits as its factorization.

18849886669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 286654464, while the sum is 73.

The spelling of 18849886669 in words is "eighteen billion, eight hundred forty-nine million, eight hundred eighty-six thousand, six hundred sixty-nine".