17643042538873 has 2 divisors, whose sum is σ = 17643042538874. Its totient is φ = 17643042538872.

The previous prime is 17643042538843. The next prime is 17643042538907. The reversal of 17643042538873 is 37883524034671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13778409477184 + 3864633061689 = 3711928^2 + 1965867^2 .

It is a cyclic number.

It is not a de Polignac number, because 17643042538873 - 2⁵ = 17643042538841 is a prime.

It is a super-2 number, since 2×17643042538873² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17643042538843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8821521269436 + 8821521269437.

It is an arithmetic number, because the mean of its divisors is an integer number (8821521269437).

Almost surely, 2^{17643042538873} is an apocalyptic number.

It is an amenable number.

17643042538873 is a deficient number, since it is larger than the sum of its proper divisors (1).

17643042538873 is an equidigital number, since it uses as much as digits as its factorization.

17643042538873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81285120, while the sum is 61.

The spelling of 17643042538873 in words is "seventeen trillion, six hundred forty-three billion, forty-two million, five hundred thirty-eight thousand, eight hundred seventy-three".