166505656 has 8 divisors (see below), whose sum is σ = 312198120. Its totient is φ = 83252824.

The previous prime is 166505639. The next prime is 166505663. The reversal of 166505656 is 656505661.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406596 + ... + 10406611.

It is an arithmetic number, because the mean of its divisors is an integer number (39024765).

Almost surely, 2^166505656 is an apocalyptic number.

It is an amenable number.

166505656 is a deficient number, since it is larger than the sum of its proper divisors (145692464).

166505656 is a wasteful number, since it uses less digits than its factorization.

166505656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20813213 (or 20813209 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 166505656 is about 12903.7070642510. The cubic root of 166505656 is about 550.1439358822.

The spelling of 166505656 in words is "one hundred sixty-six million, five hundred five thousand, six hundred fifty-six".