166521376 has 48 divisors (see below), whose sum is σ = 382669056. Its totient is φ = 69843456.

The previous prime is 166521353. The next prime is 166521379. The reversal of 166521376 is 673125661.

It is not an unprimeable number, because it can be changed into a prime (166521379) 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 7 ways as a sum of consecutive naturals, for example, 2620 + ... + 18436.

It is an arithmetic number, because the mean of its divisors is an integer number (7972272).

Almost surely, 2^166521376 is an apocalyptic number.

166521376 is a gapful number since it is divisible by the number (16) 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 166521376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191334528).

166521376 is an abundant number, since it is smaller than the sum of its proper divisors (216147680).

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

166521376 is a wasteful number, since it uses less digits than its factorization.

166521376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15881 (or 15873 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 166521376 is about 12904.3161771556. The cubic root of 166521376 is about 550.1612485884.

The spelling of 166521376 in words is "one hundred sixty-six million, five hundred twenty-one thousand, three hundred seventy-six".