17849940617591 has 2 divisors, whose sum is σ = 17849940617592. Its totient is φ = 17849940617590.

The previous prime is 17849940617567. The next prime is 17849940617633. The reversal of 17849940617591 is 19571604994871.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17849940617591 - 2¹⁸ = 17849940355447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17849940617491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8924970308795 + 8924970308796.

It is an arithmetic number, because the mean of its divisors is an integer number (8924970308796).

Almost surely, 2^{17849940617591} is an apocalyptic number.

17849940617591 is a deficient number, since it is larger than the sum of its proper divisors (1).

17849940617591 is an equidigital number, since it uses as much as digits as its factorization.

17849940617591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 17849940617591 in words is "seventeen trillion, eight hundred forty-nine billion, nine hundred forty million, six hundred seventeen thousand, five hundred ninety-one".