166315481 has 4 divisors (see below), whose sum is σ = 170810532. Its totient is φ = 161820432.

The previous prime is 166315459. The next prime is 166315519. The reversal of 166315481 is 184513661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184513661 = 3847 ⋅47963.

It can be written as a sum of positive squares in 2 ways, for example, as 115777600 + 50537881 = 10760^2 + 7109^2 .

It is a cyclic number.

It is not a de Polignac number, because 166315481 - 2²² = 162121177 is a prime.

It is a super-2 number, since 2×166315481² = 55321678440522722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166315411) 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, 2247470 + ... + 2247543.

It is an arithmetic number, because the mean of its divisors is an integer number (42702633).

Almost surely, 2^166315481 is an apocalyptic number.

It is an amenable number.

166315481 is a deficient number, since it is larger than the sum of its proper divisors (4495051).

166315481 is an equidigital number, since it uses as much as digits as its factorization.

166315481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495050.

The product of its digits is 17280, while the sum is 35.

The square root of 166315481 is about 12896.3359525099. The cubic root of 166315481 is about 549.9344065026.

The spelling of 166315481 in words is "one hundred sixty-six million, three hundred fifteen thousand, four hundred eighty-one".