166440611 has 4 divisors (see below), whose sum is σ = 166624224. Its totient is φ = 166257000.

The previous prime is 166440601. The next prime is 166440623. The reversal of 166440611 is 116044661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116044661 = 199 ⋅583139.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166440611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166440601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90440 + ... + 92261.

It is an arithmetic number, because the mean of its divisors is an integer number (41656056).

Almost surely, 2^166440611 is an apocalyptic number.

166440611 is a deficient number, since it is larger than the sum of its proper divisors (183613).

166440611 is an equidigital number, since it uses as much as digits as its factorization.

166440611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183612.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 166440611 is about 12901.1864183105. The cubic root of 166440611 is about 550.0722891209.

The spelling of 166440611 in words is "one hundred sixty-six million, four hundred forty thousand, six hundred eleven".