166577 has 4 divisors (see below), whose sum is σ = 167796. Its totient is φ = 165360.

The previous prime is 166571. The next prime is 166597. The reversal of 166577 is 775661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78961 + 87616 = 281^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 166577 - 2⁴ = 166561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374 + ... + 687.

It is an arithmetic number, because the mean of its divisors is an integer number (41949).

2¹⁶⁶⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

166577 is a deficient number, since it is larger than the sum of its proper divisors (1219).

166577 is a wasteful number, since it uses less digits than its factorization.

166577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its digits is 8820, while the sum is 32.

The square root of 166577 is about 408.1384568991. The cubic root of 166577 is about 55.0222499509.

The spelling of 166577 in words is "one hundred sixty-six thousand, five hundred seventy-seven".