17166661662749 has 2 divisors, whose sum is σ = 17166661662750. Its totient is φ = 17166661662748.

The previous prime is 17166661662737. The next prime is 17166661662833. The reversal of 17166661662749 is 94726616666171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12002032716025 + 5164628946724 = 3464395^2 + 2272582^2 .

It is a cyclic number.

It is not a de Polignac number, because 17166661662749 - 2¹⁶ = 17166661597213 is a prime.

It is a super-2 number, since 2×17166661662749² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17166661661749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8583330831374 + 8583330831375.

It is an arithmetic number, because the mean of its divisors is an integer number (8583330831375).

Almost surely, 2^{17166661662749} is an apocalyptic number.

It is an amenable number.

17166661662749 is a deficient number, since it is larger than the sum of its proper divisors (1).

17166661662749 is an equidigital number, since it uses as much as digits as its factorization.

17166661662749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164602368, while the sum is 68.

The spelling of 17166661662749 in words is "seventeen trillion, one hundred sixty-six billion, six hundred sixty-one million, six hundred sixty-two thousand, seven hundred forty-nine".