173066706420221 has 16 divisors (see below), whose sum is σ = 181569193398768. Its totient is φ = 164815782912000.

The previous prime is 173066706420197. The next prime is 173066706420233. The reversal of 173066706420221 is 122024607660371.

It can be written as a sum of positive squares in 8 ways, for example, as 42178348404196 + 130888358016025 = 6494486^2 + 11440645^2 .

It is a cyclic number.

It is not a de Polignac number, because 173066706420221 - 2¹⁸ = 173066706158077 is a prime.

It is a super-2 number, since 2×173066706420221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173066706420281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297770630 + ... + 298351271.

It is an arithmetic number, because the mean of its divisors is an integer number (11348074587423).

Almost surely, 2^{173066706420221} is an apocalyptic number.

It is an amenable number.

173066706420221 is a deficient number, since it is larger than the sum of its proper divisors (8502486978547).

173066706420221 is an equidigital number, since it uses as much as digits as its factorization.

173066706420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596122112.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 173066706420221 in words is "one hundred seventy-three trillion, sixty-six billion, seven hundred six million, four hundred twenty thousand, two hundred twenty-one".