18333430861 has 2 divisors, whose sum is σ = 18333430862. Its totient is φ = 18333430860.

The previous prime is 18333430793. The next prime is 18333430889. The reversal of 18333430861 is 16803433381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9833697225 + 8499733636 = 99165^2 + 92194^2 .

It is a cyclic number.

It is not a de Polignac number, because 18333430861 - 2¹³ = 18333422669 is a prime.

It is a super-2 number, since 2×18333430861² (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 (18333430261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9166715430 + 9166715431.

It is an arithmetic number, because the mean of its divisors is an integer number (9166715431).

Almost surely, 2^18333430861 is an apocalyptic number.

It is an amenable number.

18333430861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18333430861 is an equidigital number, since it uses as much as digits as its factorization.

18333430861 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 40.

The spelling of 18333430861 in words is "eighteen billion, three hundred thirty-three million, four hundred thirty thousand, eight hundred sixty-one".