166544531 has 4 divisors (see below), whose sum is σ = 166710600. Its totient is φ = 166378464.

The previous prime is 166544507. The next prime is 166544533. The reversal of 166544531 is 135445661.

166544531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 166544531 - 2⁶ = 166544467 is a prime.

It is a super-2 number, since 2×166544531² = 55474161612019922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166544491 and 166544500.

It is not an unprimeable number, because it can be changed into a prime (166544533) 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, 81521 + ... + 83538.

It is an arithmetic number, because the mean of its divisors is an integer number (41677650).

Almost surely, 2^166544531 is an apocalyptic number.

166544531 is a deficient number, since it is larger than the sum of its proper divisors (166069).

166544531 is a wasteful number, since it uses less digits than its factorization.

166544531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166068.

The product of its digits is 43200, while the sum is 35.

The square root of 166544531 is about 12905.2133264042. The cubic root of 166544531 is about 550.1867476036.

The spelling of 166544531 in words is "one hundred sixty-six million, five hundred forty-four thousand, five hundred thirty-one".