173985351365869 has 2 divisors, whose sum is σ = 173985351365870. Its totient is φ = 173985351365868.

The previous prime is 173985351365863. The next prime is 173985351365921. The reversal of 173985351365869 is 968563153589371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173387533228900 + 597818136969 = 13167670^2 + 773187^2 .

It is a cyclic number.

It is not a de Polignac number, because 173985351365869 - 2³¹ = 173983203882221 is a prime.

It is a super-2 number, since 2×173985351365869² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173985351365863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86992675682934 + 86992675682935.

It is an arithmetic number, because the mean of its divisors is an integer number (86992675682935).

Almost surely, 2^{173985351365869} is an apocalyptic number.

It is an amenable number.

173985351365869 is a deficient number, since it is larger than the sum of its proper divisors (1).

173985351365869 is an equidigital number, since it uses as much as digits as its factorization.

173985351365869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992000, while the sum is 79.

The spelling of 173985351365869 in words is "one hundred seventy-three trillion, nine hundred eighty-five billion, three hundred fifty-one million, three hundred sixty-five thousand, eight hundred sixty-nine".