173246791681 has 2 divisors, whose sum is σ = 173246791682. Its totient is φ = 173246791680.

The previous prime is 173246791661. The next prime is 173246791691. The reversal of 173246791681 is 186197642371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161129185281 + 12117606400 = 401409^2 + 110080^2 .

It is a cyclic number.

It is not a de Polignac number, because 173246791681 - 2⁵ = 173246791649 is a prime.

It is a super-2 number, since 2×173246791681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (173246791621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86623395840 + 86623395841.

It is an arithmetic number, because the mean of its divisors is an integer number (86623395841).

Almost surely, 2^173246791681 is an apocalyptic number.

It is an amenable number.

173246791681 is a deficient number, since it is larger than the sum of its proper divisors (1).

173246791681 is an equidigital number, since it uses as much as digits as its factorization.

173246791681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The spelling of 173246791681 in words is "one hundred seventy-three billion, two hundred forty-six million, seven hundred ninety-one thousand, six hundred eighty-one".