18336025861 has 2 divisors, whose sum is σ = 18336025862. Its totient is φ = 18336025860.

The previous prime is 18336025843. The next prime is 18336025919. The reversal of 18336025861 is 16852063381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18066048100 + 269977761 = 134410^2 + 16431^2 .

It is a cyclic number.

It is not a de Polignac number, because 18336025861 - 2¹³ = 18336017669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18336023861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9168012930 + 9168012931.

It is an arithmetic number, because the mean of its divisors is an integer number (9168012931).

Almost surely, 2^18336025861 is an apocalyptic number.

It is an amenable number.

18336025861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18336025861 is an equidigital number, since it uses as much as digits as its factorization.

18336025861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 18336025861 in words is "eighteen billion, three hundred thirty-six million, twenty-five thousand, eight hundred sixty-one".