6666965 has 4 divisors (see below), whose sum is σ = 8000364. Its totient is φ = 5333568.

The previous prime is 6666949. The next prime is 6666977. The reversal of 6666965 is 5696666.

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 4036081 + 2630884 = 2009^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666965 - 2⁴ = 6666949 is a prime.

It is a super-2 number, since 2×6666965² = 88896844622450, which contains 22 as substring.

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, 666692 + ... + 666701.

It is an arithmetic number, because the mean of its divisors is an integer number (2000091).

Almost surely, 2^6666965 is an apocalyptic number.

It is an amenable number.

6666965 is a deficient number, since it is larger than the sum of its proper divisors (1333399).

6666965 is a wasteful number, since it uses less digits than its factorization.

6666965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333398.

The product of its digits is 349920, while the sum is 44.

The square root of 6666965 is about 2582.0466688269. The cubic root of 6666965 is about 188.2100131585.

Subtracting from 6666965 its reverse (5696666), we obtain a cube (970299 = 99³).

The spelling of 6666965 in words is "six million, six hundred sixty-six thousand, nine hundred sixty-five".