166811481 has 24 divisors (see below), whose sum is σ = 250496064. Its totient is φ = 110931120.

The previous prime is 166811461. The next prime is 166811483. The reversal of 166811481 is 184118661.

166811481 is a `hidden beast` number, since 166 + 8 + 11 + 481 = 666.

It is not a de Polignac number, because 166811481 - 2²⁷ = 32593753 is a prime.

It is a super-2 number, since 2×166811481² = 55652140386826722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166811483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156691 + ... + 157751.

It is an arithmetic number, because the mean of its divisors is an integer number (10437336).

Almost surely, 2^166811481 is an apocalyptic number.

It is an amenable number.

166811481 is a deficient number, since it is larger than the sum of its proper divisors (83684583).

166811481 is an equidigital number, since it uses as much as digits as its factorization.

166811481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723 (or 1711 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 166811481 is about 12915.5519045839. The cubic root of 166811481 is about 550.4805508056.

The spelling of 166811481 in words is "one hundred sixty-six million, eight hundred eleven thousand, four hundred eighty-one".