159166581 has 16 divisors (see below), whose sum is σ = 247701504. Its totient is φ = 89016624.

The previous prime is 159166573. The next prime is 159166583. The reversal of 159166581 is 185661951.

It is not a de Polignac number, because 159166581 - 2³ = 159166573 is a prime.

It is a super-2 number, since 2×159166581² = 50668001014459122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159166583) 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, 79645 + ... + 81618.

It is an arithmetic number, because the mean of its divisors is an integer number (15481344).

Almost surely, 2^159166581 is an apocalyptic number.

It is an amenable number.

159166581 is a deficient number, since it is larger than the sum of its proper divisors (88534923).

159166581 is a wasteful number, since it uses less digits than its factorization.

159166581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161320.

The product of its digits is 64800, while the sum is 42.

The square root of 159166581 is about 12616.1238500579. The cubic root of 159166581 is about 541.9392789281.

The spelling of 159166581 in words is "one hundred fifty-nine million, one hundred sixty-six thousand, five hundred eighty-one".