166606531 has 16 divisors (see below), whose sum is σ = 205357824. Its totient is φ = 131625504.

The previous prime is 166606519. The next prime is 166606589. The reversal of 166606531 is 135606661.

It is a cyclic number.

It is not a de Polignac number, because 166606531 - 2⁵ = 166606499 is a prime.

It is a super-2 number, since 2×166606531² = 55515472343707922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166606591) 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, 116040 + ... + 117466.

It is an arithmetic number, because the mean of its divisors is an integer number (12834864).

Almost surely, 2^166606531 is an apocalyptic number.

166606531 is a deficient number, since it is larger than the sum of its proper divisors (38751293).

166606531 is a wasteful number, since it uses less digits than its factorization.

166606531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 166606531 is about 12907.6152328771. The cubic root of 166606531 is about 550.2550123215.

The spelling of 166606531 in words is "one hundred sixty-six million, six hundred six thousand, five hundred thirty-one".