18336023861 has 2 divisors, whose sum is σ = 18336023862. Its totient is φ = 18336023860.

The previous prime is 18336023843. The next prime is 18336023869. The reversal of 18336023861 is 16832063381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12903596836 + 5432427025 = 113594^2 + 73705^2 .

It is a cyclic number.

It is not a de Polignac number, because 18336023861 - 2³⁴ = 1156154677 is a prime.

It is a super-2 number, since 2×18336023861² (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 (18336023869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9168011930 + 9168011931.

It is an arithmetic number, because the mean of its divisors is an integer number (9168011931).

Almost surely, 2^18336023861 is an apocalyptic number.

It is an amenable number.

18336023861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18336023861 is an equidigital number, since it uses as much as digits as its factorization.

18336023861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 18336023861 in words is "eighteen billion, three hundred thirty-six million, twenty-three thousand, eight hundred sixty-one".