17941863689 has 2 divisors, whose sum is σ = 17941863690. Its totient is φ = 17941863688.

The previous prime is 17941863679. The next prime is 17941863697. The reversal of 17941863689 is 98636814971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15244100089 + 2697763600 = 123467^2 + 51940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17941863689 is a prime.

It is not a weakly prime, because it can be changed into another prime (17941863679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8970931844 + 8970931845.

It is an arithmetic number, because the mean of its divisors is an integer number (8970931845).

Almost surely, 2^17941863689 is an apocalyptic number.

It is an amenable number.

17941863689 is a deficient number, since it is larger than the sum of its proper divisors (1).

17941863689 is an equidigital number, since it uses as much as digits as its factorization.

17941863689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 62.

The spelling of 17941863689 in words is "seventeen billion, nine hundred forty-one million, eight hundred sixty-three thousand, six hundred eighty-nine".