166531061 has 4 divisors (see below), whose sum is σ = 166623072. Its totient is φ = 166439052.

The previous prime is 166531051. The next prime is 166531087. The reversal of 166531061 is 160135661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166531061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166531051) 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, 43235 + ... + 46928.

It is an arithmetic number, because the mean of its divisors is an integer number (41655768).

Almost surely, 2^166531061 is an apocalyptic number.

It is an amenable number.

166531061 is a deficient number, since it is larger than the sum of its proper divisors (92011).

166531061 is an equidigital number, since it uses as much as digits as its factorization.

166531061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92010.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 166531061 is about 12904.6914337384. The cubic root of 166531061 is about 550.1719143030.

The spelling of 166531061 in words is "one hundred sixty-six million, five hundred thirty-one thousand, sixty-one".