17849493749609 has 2 divisors, whose sum is σ = 17849493749610. Its totient is φ = 17849493749608.

The previous prime is 17849493749603. The next prime is 17849493749621. The reversal of 17849493749609 is 90694739494871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17277697656025 + 571796093584 = 4156645^2 + 756172^2 .

It is a cyclic number.

It is not a de Polignac number, because 17849493749609 - 2²⁸ = 17849225314153 is a prime.

It is not a weakly prime, because it can be changed into another prime (17849493749603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8924746874804 + 8924746874805.

It is an arithmetic number, because the mean of its divisors is an integer number (8924746874805).

Almost surely, 2^{17849493749609} is an apocalyptic number.

It is an amenable number.

17849493749609 is a deficient number, since it is larger than the sum of its proper divisors (1).

17849493749609 is an equidigital number, since it uses as much as digits as its factorization.

17849493749609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2962842624, while the sum is 80.

The spelling of 17849493749609 in words is "seventeen trillion, eight hundred forty-nine billion, four hundred ninety-three million, seven hundred forty-nine thousand, six hundred nine".