166491576 has 96 divisors (see below), whose sum is σ = 470870400. Its totient is φ = 53084160.

The previous prime is 166491551. The next prime is 166491587. The reversal of 166491576 is 675194661.

166491576 is a `hidden beast` number, since 16 + 64 + 9 + 1 + 576 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216120 + ... + 216888.

It is an arithmetic number, because the mean of its divisors is an integer number (4904900).

Almost surely, 2^166491576 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 166491576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235435200).

166491576 is an abundant number, since it is smaller than the sum of its proper divisors (304378824).

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

166491576 is a wasteful number, since it uses less digits than its factorization.

166491576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 902 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 166491576 is about 12903.1614730654. The cubic root of 166491576 is about 550.1284284110.

It can be divided in two parts, 16649 and 1576, that added together give a square (18225 = 135²).

The spelling of 166491576 in words is "one hundred sixty-six million, four hundred ninety-one thousand, five hundred seventy-six".