6665845 has 4 divisors (see below), whose sum is σ = 7999020. Its totient is φ = 5332672.

The previous prime is 6665843. The next prime is 6665861. The reversal of 6665845 is 5485666.

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 4235364 + 2430481 = 2058^2 + 1559^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665845 - 2¹ = 6665843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6665798 and 6665807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666580 + ... + 666589.

It is an arithmetic number, because the mean of its divisors is an integer number (1999755).

Almost surely, 2^6665845 is an apocalyptic number.

It is an amenable number.

6665845 is a deficient number, since it is larger than the sum of its proper divisors (1333175).

6665845 is a wasteful number, since it uses less digits than its factorization.

6665845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333174.

The product of its digits is 172800, while the sum is 40.

The square root of 6665845 is about 2581.8297775028. The cubic root of 6665845 is about 188.1994732791.

The spelling of 6665845 in words is "six million, six hundred sixty-five thousand, eight hundred forty-five".