2666865 has 8 divisors (see below), whose sum is σ = 4267008. Its totient is φ = 1422320.

The previous prime is 2666863. The next prime is 2666887. The reversal of 2666865 is 5686662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2666865 - 2¹ = 2666863 is a prime.

It is a super-2 number, since 2×2666865² = 14224337856450, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2666861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88881 + ... + 88910.

It is an arithmetic number, because the mean of its divisors is an integer number (533376).

2^2666865 is an apocalyptic number.

It is an amenable number.

2666865 is a deficient number, since it is larger than the sum of its proper divisors (1600143).

2666865 is a wasteful number, since it uses less digits than its factorization.

2666865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177799.

The product of its digits is 103680, while the sum is 39.

The square root of 2666865 is about 1633.0538876596. The cubic root of 2666865 is about 138.6756927012.

The spelling of 2666865 in words is "two million, six hundred sixty-six thousand, eight hundred sixty-five".