166490856 has 128 divisors (see below), whose sum is σ = 546912000. Its totient is φ = 45916416.

The previous prime is 166490837. The next prime is 166490869. The reversal of 166490856 is 658094661.

It is a super-2 number, since 2×166490856² = 55438410263225472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41950 + ... + 45746.

It is an arithmetic number, because the mean of its divisors is an integer number (4272750).

Almost surely, 2^166490856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166490856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273456000).

166490856 is an abundant number, since it is smaller than the sum of its proper divisors (380421144).

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

166490856 is a wasteful number, since it uses less digits than its factorization.

166490856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3848 (or 3838 counting only the distinct ones).

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

The square root of 166490856 is about 12903.1335728962. The cubic root of 166490856 is about 550.1276353919.

The spelling of 166490856 in words is "one hundred sixty-six million, four hundred ninety thousand, eight hundred fifty-six".