166775521 has 16 divisors (see below), whose sum is σ = 194227200. Its totient is φ = 141598800.

The previous prime is 166775519. The next prime is 166775527. The reversal of 166775521 is 125577661.

It is a happy number.

166775521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166775521 - 2¹ = 166775519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166775527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9220 + ... + 20458.

It is an arithmetic number, because the mean of its divisors is an integer number (12139200).

Almost surely, 2^166775521 is an apocalyptic number.

166775521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166775521 is a deficient number, since it is larger than the sum of its proper divisors (27451679).

166775521 is a wasteful number, since it uses less digits than its factorization.

166775521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11340.

The product of its digits is 88200, while the sum is 40.

The square root of 166775521 is about 12914.1597094042. The cubic root of 166775521 is about 550.4409917714.

The spelling of 166775521 in words is "one hundred sixty-six million, seven hundred seventy-five thousand, five hundred twenty-one".