161166566 has 32 divisors (see below), whose sum is σ = 276576768. Its totient is φ = 69720640.

The previous prime is 161166559. The next prime is 161166571. The reversal of 161166566 is 665661161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117215 + ... + 118581.

It is an arithmetic number, because the mean of its divisors is an integer number (8643024).

Almost surely, 2^161166566 is an apocalyptic number.

161166566 is a deficient number, since it is larger than the sum of its proper divisors (115410202).

161166566 is a wasteful number, since it uses less digits than its factorization.

161166566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636.

The product of its digits is 38880, while the sum is 38.

The square root of 161166566 is about 12695.1394635900. The cubic root of 161166566 is about 544.1997243682.

The spelling of 161166566 in words is "one hundred sixty-one million, one hundred sixty-six thousand, five hundred sixty-six".