18208849287731 has 2 divisors, whose sum is σ = 18208849287732. Its totient is φ = 18208849287730.

The previous prime is 18208849287719. The next prime is 18208849287767. The reversal of 18208849287731 is 13778294880281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18208849287731 - 2³⁰ = 18207775545907 is a prime.

It is a super-2 number, since 2×18208849287731² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18208849287791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9104424643865 + 9104424643866.

It is an arithmetic number, because the mean of its divisors is an integer number (9104424643866).

Almost surely, 2^{18208849287731} is an apocalyptic number.

18208849287731 is a deficient number, since it is larger than the sum of its proper divisors (1).

18208849287731 is an equidigital number, since it uses as much as digits as its factorization.

18208849287731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86704128, while the sum is 68.

The spelling of 18208849287731 in words is "eighteen trillion, two hundred eight billion, eight hundred forty-nine million, two hundred eighty-seven thousand, seven hundred thirty-one".