6620665 has 8 divisors (see below), whose sum is σ = 8290368. Its totient is φ = 5066160.

The previous prime is 6620629. The next prime is 6620681. The reversal of 6620665 is 5660266.

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

It is not a de Polignac number, because 6620665 - 2¹¹ = 6618617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28671 + ... + 28900.

It is an arithmetic number, because the mean of its divisors is an integer number (1036296).

Almost surely, 2^6620665 is an apocalyptic number.

It is an amenable number.

6620665 is a deficient number, since it is larger than the sum of its proper divisors (1669703).

6620665 is a wasteful number, since it uses less digits than its factorization.

6620665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57599.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 6620665 is about 2573.0652926034. The cubic root of 6620665 is about 187.7733139961.

The spelling of 6620665 in words is "six million, six hundred twenty thousand, six hundred sixty-five".