6663965 has 32 divisors (see below), whose sum is σ = 10506240. Its totient is φ = 3931200.

The previous prime is 6663961. The next prime is 6663971. The reversal of 6663965 is 5693666.

It is not a de Polignac number, because 6663965 - 2² = 6663961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6860 + ... + 7770.

It is an arithmetic number, because the mean of its divisors is an integer number (328320).

Almost surely, 2^6663965 is an apocalyptic number.

It is an amenable number.

6663965 is a deficient number, since it is larger than the sum of its proper divisors (3842275).

6663965 is a wasteful number, since it uses less digits than its factorization.

6663965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953.

The product of its digits is 174960, while the sum is 41.

The square root of 6663965 is about 2581.4656689563. The cubic root of 6663965 is about 188.1817786844.

Subtracting from 6663965 its reverse (5693666), we obtain a cube (970299 = 99³).

The spelling of 6663965 in words is "six million, six hundred sixty-three thousand, nine hundred sixty-five".