17940846361 has 2 divisors, whose sum is σ = 17940846362. Its totient is φ = 17940846360.

The previous prime is 17940846323. The next prime is 17940846397. The reversal of 17940846361 is 16364804971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15890115136 + 2050731225 = 126056^2 + 45285^2 .

It is an emirp because it is prime and its reverse (16364804971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17940846361 - 2¹⁹ = 17940322073 is a prime.

It is not a weakly prime, because it can be changed into another prime (17940846961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8970423180 + 8970423181.

It is an arithmetic number, because the mean of its divisors is an integer number (8970423181).

Almost surely, 2^17940846361 is an apocalyptic number.

It is an amenable number.

17940846361 is a deficient number, since it is larger than the sum of its proper divisors (1).

17940846361 is an equidigital number, since it uses as much as digits as its factorization.

17940846361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 17940846361 in words is "seventeen billion, nine hundred forty million, eight hundred forty-six thousand, three hundred sixty-one".