17871144689 has 2 divisors, whose sum is σ = 17871144690. Its totient is φ = 17871144688.

The previous prime is 17871144671. The next prime is 17871144703. The reversal of 17871144689 is 98644117871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17724928225 + 146216464 = 133135^2 + 12092^2 .

It is a cyclic number.

It is not a de Polignac number, because 17871144689 - 2¹⁶ = 17871079153 is a prime.

It is not a weakly prime, because it can be changed into another prime (17871144649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8935572344 + 8935572345.

It is an arithmetic number, because the mean of its divisors is an integer number (8935572345).

Almost surely, 2^17871144689 is an apocalyptic number.

It is an amenable number.

17871144689 is a deficient number, since it is larger than the sum of its proper divisors (1).

17871144689 is an equidigital number, since it uses as much as digits as its factorization.

17871144689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 56.

The spelling of 17871144689 in words is "seventeen billion, eight hundred seventy-one million, one hundred forty-four thousand, six hundred eighty-nine".