18208849287791 has 2 divisors, whose sum is σ = 18208849287792. Its totient is φ = 18208849287790.

The previous prime is 18208849287767. The next prime is 18208849287799. The reversal of 18208849287791 is 19778294880281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18208849287791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18208849287799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9104424643895 + 9104424643896.

It is an arithmetic number, because the mean of its divisors is an integer number (9104424643896).

Almost surely, 2^{18208849287791} is an apocalyptic number.

18208849287791 is a deficient number, since it is larger than the sum of its proper divisors (1).

18208849287791 is an equidigital number, since it uses as much as digits as its factorization.

18208849287791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 260112384, while the sum is 74.

The spelling of 18208849287791 in words is "eighteen trillion, two hundred eight billion, eight hundred forty-nine million, two hundred eighty-seven thousand, seven hundred ninety-one".