166681656 has 24 divisors (see below), whose sum is σ = 451429680. Its totient is φ = 55560528.

The previous prime is 166681643. The next prime is 166681709. The reversal of 166681656 is 656186661.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1157440 + ... + 1157583.

It is an arithmetic number, because the mean of its divisors is an integer number (18809570).

Almost surely, 2^166681656 is an apocalyptic number.

It is an amenable number.

166681656 is an abundant number, since it is smaller than the sum of its proper divisors (284748024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166681656 is a wasteful number, since it uses less digits than its factorization.

166681656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315035 (or 2315028 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 166681656 is about 12910.5250086896. The cubic root of 166681656 is about 550.3377055506.

The spelling of 166681656 in words is "one hundred sixty-six million, six hundred eighty-one thousand, six hundred fifty-six".