2666765 has 4 divisors (see below), whose sum is σ = 3200124. Its totient is φ = 2133408.

The previous prime is 2666749. The next prime is 2666779. The reversal of 2666765 is 5676662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 630436 + 2036329 = 794^2 + 1427^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666765 - 2⁴ = 2666749 is a prime.

It is a super-2 number, since 2×2666765² = 14223271130450, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266672 + ... + 266681.

It is an arithmetic number, because the mean of its divisors is an integer number (800031).

2^2666765 is an apocalyptic number.

It is an amenable number.

2666765 is a deficient number, since it is larger than the sum of its proper divisors (533359).

2666765 is an equidigital number, since it uses as much as digits as its factorization.

2666765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533358.

The product of its digits is 90720, while the sum is 38.

The square root of 2666765 is about 1633.0232698893. The cubic root of 2666765 is about 138.6739593623.

The spelling of 2666765 in words is "two million, six hundred sixty-six thousand, seven hundred sixty-five".