2665881 has 12 divisors (see below), whose sum is σ = 3880240. Its totient is φ = 1763640.

The previous prime is 2665879. The next prime is 2665891. The reversal of 2665881 is 1885662.

It is a happy number.

2665881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2665881 - 2¹ = 2665879 is a prime.

It is a super-2 number, since 2×2665881² = 14213843012322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186 + ... + 2316.

2^2665881 is an apocalyptic number.

It is an amenable number.

2665881 is a deficient number, since it is larger than the sum of its proper divisors (1214359).

2665881 is a wasteful number, since it uses less digits than its factorization.

2665881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276 (or 2273 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2665881 is about 1632.7525838289. The cubic root of 2665881 is about 138.6586347614.

The spelling of 2665881 in words is "two million, six hundred sixty-five thousand, eight hundred eighty-one".