166111556 has 24 divisors (see below), whose sum is σ = 331473240. Its totient is φ = 72156672.

The previous prime is 166111553. The next prime is 166111577. The reversal of 166111556 is 655111661.

166111556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 217156 + 165894400 = 466^2 + 12880^2 .

It is a super-2 number, since 2×166111556² = 55186098073482272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166111553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93071 + ... + 94838.

It is an arithmetic number, because the mean of its divisors is an integer number (13811385).

Almost surely, 2^166111556 is an apocalyptic number.

It is an amenable number.

166111556 is a deficient number, since it is larger than the sum of its proper divisors (165361684).

166111556 is a wasteful number, since it uses less digits than its factorization.

166111556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187943 (or 187941 counting only the distinct ones).

The product of its digits is 5400, while the sum is 32.

The square root of 166111556 is about 12888.4272120379. The cubic root of 166111556 is about 549.7095502245.

The spelling of 166111556 in words is "one hundred sixty-six million, one hundred eleven thousand, five hundred fifty-six".