18328253861 has 2 divisors, whose sum is σ = 18328253862. Its totient is φ = 18328253860.

The previous prime is 18328253857. The next prime is 18328253863. The reversal of 18328253861 is 16835282381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9528688225 + 8799565636 = 97615^2 + 93806^2 .

It is a cyclic number.

It is not a de Polignac number, because 18328253861 - 2² = 18328253857 is a prime.

It is a super-2 number, since 2×18328253861² (a number of 21 digits) contains 22 as substring.

Together with 18328253863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18328253863) 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, 9164126930 + 9164126931.

It is an arithmetic number, because the mean of its divisors is an integer number (9164126931).

Almost surely, 2^18328253861 is an apocalyptic number.

It is an amenable number.

18328253861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328253861 is an equidigital number, since it uses as much as digits as its factorization.

18328253861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 47.

The spelling of 18328253861 in words is "eighteen billion, three hundred twenty-eight million, two hundred fifty-three thousand, eight hundred sixty-one".