6669181 has 4 divisors (see below), whose sum is σ = 6674364. Its totient is φ = 6664000.

The previous prime is 6669163. The next prime is 6669197. The reversal of 6669181 is 1819666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1819666 = 2 ⋅909833.

It can be written as a sum of positive squares in 2 ways, for example, as 1071225 + 5597956 = 1035^2 + 2366^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669181 - 2⁷ = 6669053 is a prime.

It is a super-2 number, since 2×6669181² = 88955950421522, which contains 22 as substring.

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 6669181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6669121) 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, 981 + ... + 3781.

It is an arithmetic number, because the mean of its divisors is an integer number (1668591).

Almost surely, 2^6669181 is an apocalyptic number.

It is an amenable number.

6669181 is a deficient number, since it is larger than the sum of its proper divisors (5183).

6669181 is a wasteful number, since it uses less digits than its factorization.

6669181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5182.

The product of its digits is 15552, while the sum is 37.

The square root of 6669181 is about 2582.4757501282. The cubic root of 6669181 is about 188.2308635848.

The spelling of 6669181 in words is "six million, six hundred sixty-nine thousand, one hundred eighty-one".