168881566 has 8 divisors (see below), whose sum is σ = 289511280. Its totient is φ = 72377808.

The previous prime is 168881561. The next prime is 168881569. The reversal of 168881566 is 665188861.

168881566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×168881566² = 57041966669224712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168881561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6031471 + ... + 6031498.

It is an arithmetic number, because the mean of its divisors is an integer number (36188910).

Almost surely, 2^168881566 is an apocalyptic number.

168881566 is a deficient number, since it is larger than the sum of its proper divisors (120629714).

168881566 is a wasteful number, since it uses less digits than its factorization.

168881566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12062978.

The product of its digits is 552960, while the sum is 49.

The square root of 168881566 is about 12995.4440478192. Note that the first 3 decimals coincide. The cubic root of 168881566 is about 552.7483003157.

The spelling of 168881566 in words is "one hundred sixty-eight million, eight hundred eighty-one thousand, five hundred sixty-six".