166856560 has 80 divisors (see below), whose sum is σ = 423035424. Its totient is φ = 60834816.

The previous prime is 166856531. The next prime is 166856567. The reversal of 166856560 is 65658661.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×166856560² = 55682223230067200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166856567) 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 15 ways as a sum of consecutive naturals, for example, 85354 + ... + 87286.

Almost surely, 2^166856560 is an apocalyptic number.

166856560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166856560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211517712).

166856560 is an abundant number, since it is smaller than the sum of its proper divisors (256178864).

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

166856560 is a wasteful number, since it uses less digits than its factorization.

166856560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042 (or 2036 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 166856560 is about 12917.2969308598. The cubic root of 166856560 is about 550.5301334794.

The spelling of 166856560 in words is "one hundred sixty-six million, eight hundred fifty-six thousand, five hundred sixty".