166010561 has 4 divisors (see below), whose sum is σ = 166366512. Its totient is φ = 165654612.

The previous prime is 166010531. The next prime is 166010563. The reversal of 166010561 is 165010661.

166010561 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166010561 - 2⁶ = 166010497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166010561.

It is not an unprimeable number, because it can be changed into a prime (166010563) 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, 177275 + ... + 178208.

It is an arithmetic number, because the mean of its divisors is an integer number (41591628).

Almost surely, 2^166010561 is an apocalyptic number.

It is an amenable number.

166010561 is a deficient number, since it is larger than the sum of its proper divisors (355951).

166010561 is an equidigital number, since it uses as much as digits as its factorization.

166010561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355950.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 166010561 is about 12884.5085664918. The cubic root of 166010561 is about 549.5981207476.

It can be divided in two parts, 1660 and 10561, that added together give a palindrome (12221).

The spelling of 166010561 in words is "one hundred sixty-six million, ten thousand, five hundred sixty-one".