17849425817 has 2 divisors, whose sum is σ = 17849425818. Its totient is φ = 17849425816.

The previous prime is 17849425813. The next prime is 17849425871. The reversal of 17849425817 is 71852494871.

Together with next prime (17849425871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15430359961 + 2419065856 = 124219^2 + 49184^2 .

It is a cyclic number.

It is not a de Polignac number, because 17849425817 - 2² = 17849425813 is a prime.

It is a super-2 number, since 2×17849425817² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17849425813) 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, 8924712908 + 8924712909.

It is an arithmetic number, because the mean of its divisors is an integer number (8924712909).

Almost surely, 2^17849425817 is an apocalyptic number.

It is an amenable number.

17849425817 is a deficient number, since it is larger than the sum of its proper divisors (1).

17849425817 is an equidigital number, since it uses as much as digits as its factorization.

17849425817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4515840, while the sum is 56.

The spelling of 17849425817 in words is "seventeen billion, eight hundred forty-nine million, four hundred twenty-five thousand, eight hundred seventeen".