15818998009 has 2 divisors, whose sum is σ = 15818998010. Its totient is φ = 15818998008.

The previous prime is 15818998007. The next prime is 15818998051. The reversal of 15818998009 is 90089981851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14820627600 + 998370409 = 121740^2 + 31597^2 .

It is a cyclic number.

It is not a de Polignac number, because 15818998009 - 2¹ = 15818998007 is a prime.

Together with 15818998007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15818998001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7909499004 + 7909499005.

It is an arithmetic number, because the mean of its divisors is an integer number (7909499005).

Almost surely, 2^15818998009 is an apocalyptic number.

It is an amenable number.

15818998009 is a deficient number, since it is larger than the sum of its proper divisors (1).

15818998009 is an equidigital number, since it uses as much as digits as its factorization.

15818998009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 58.

The spelling of 15818998009 in words is "fifteen billion, eight hundred eighteen million, nine hundred ninety-eight thousand, nine".