173165661 has 32 divisors (see below), whose sum is σ = 266340480. Its totient is φ = 111103488.

The previous prime is 173165633. The next prime is 173165669. The reversal of 173165661 is 166561371.

It is not a de Polignac number, because 173165661 - 2⁷ = 173165533 is a prime.

It is a super-2 number, since 2×173165661² = 59972692299133842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173165669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96010 + ... + 97796.

It is an arithmetic number, because the mean of its divisors is an integer number (8323140).

Almost surely, 2^173165661 is an apocalyptic number.

It is an amenable number.

173165661 is a deficient number, since it is larger than the sum of its proper divisors (93174819).

173165661 is a wasteful number, since it uses less digits than its factorization.

173165661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930 (or 1924 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 173165661 is about 13159.2424174038. The cubic root of 173165661 is about 557.3832647190.

The spelling of 173165661 in words is "one hundred seventy-three million, one hundred sixty-five thousand, six hundred sixty-one".