6663945 has 16 divisors (see below), whose sum is σ = 10838592. Its totient is φ = 3495360.

The previous prime is 6663941. The next prime is 6663961. The reversal of 6663945 is 5493666.

It is a happy number.

It is not a de Polignac number, because 6663945 - 2² = 6663941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6663941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2727 + ... + 4556.

It is an arithmetic number, because the mean of its divisors is an integer number (677412).

Almost surely, 2^6663945 is an apocalyptic number.

It is an amenable number.

6663945 is a deficient number, since it is larger than the sum of its proper divisors (4174647).

6663945 is a wasteful number, since it uses less digits than its factorization.

6663945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7352.

The product of its digits is 116640, while the sum is 39.

The square root of 6663945 is about 2581.4617951850. The cubic root of 6663945 is about 188.1815904261.

The spelling of 6663945 in words is "six million, six hundred sixty-three thousand, nine hundred forty-five".