6945665 has 4 divisors (see below), whose sum is σ = 8334804. Its totient is φ = 5556528.

The previous prime is 6945641. The next prime is 6945671. The reversal of 6945665 is 5665496.

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 1874161 + 5071504 = 1369^2 + 2252^2 .

It is a cyclic number.

It is not a de Polignac number, because 6945665 - 2²² = 2751361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694562 + ... + 694571.

It is an arithmetic number, because the mean of its divisors is an integer number (2083701).

Almost surely, 2^6945665 is an apocalyptic number.

It is an amenable number.

6945665 is a deficient number, since it is larger than the sum of its proper divisors (1389139).

6945665 is a wasteful number, since it uses less digits than its factorization.

6945665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389138.

The product of its digits is 194400, while the sum is 41.

The square root of 6945665 is about 2635.4629574327. The cubic root of 6945665 is about 190.7968839361.

The spelling of 6945665 in words is "six million, nine hundred forty-five thousand, six hundred sixty-five".