166551556 has 24 divisors (see below), whose sum is σ = 311217984. Its totient is φ = 77800800.

The previous prime is 166551551. The next prime is 166551557. The reversal of 166551556 is 655155661.

It is a super-2 number, since 2×166551556² = 55478841612042272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166551551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17095 + ... + 25006.

It is an arithmetic number, because the mean of its divisors is an integer number (12967416).

Almost surely, 2^166551556 is an apocalyptic number.

It is an amenable number.

166551556 is a deficient number, since it is larger than the sum of its proper divisors (144666428).

166551556 is a wasteful number, since it uses less digits than its factorization.

166551556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42171 (or 42169 counting only the distinct ones).

The product of its digits is 135000, while the sum is 40.

The square root of 166551556 is about 12905.4855003599. The cubic root of 166551556 is about 550.1944832876.

The spelling of 166551556 in words is "one hundred sixty-six million, five hundred fifty-one thousand, five hundred fifty-six".