166506556 has 12 divisors (see below), whose sum is σ = 291496968. Its totient is φ = 83221712.

The previous prime is 166506541. The next prime is 166506563. The reversal of 166506556 is 655605661.

166506556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166506556² = 55448866381962272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7170 + ... + 19606.

It is an arithmetic number, because the mean of its divisors is an integer number (24291414).

Almost surely, 2^166506556 is an apocalyptic number.

It is an amenable number.

166506556 is a deficient number, since it is larger than the sum of its proper divisors (124990412).

166506556 is a wasteful number, since it uses less digits than its factorization.

166506556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15788 (or 15786 counting only the distinct ones).

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

The square root of 166506556 is about 12903.7419379031. The cubic root of 166506556 is about 550.1449270971.

The spelling of 166506556 in words is "one hundred sixty-six million, five hundred six thousand, five hundred fifty-six".