6663957 has 8 divisors (see below), whose sum is σ = 8910240. Its totient is φ = 4430160.

The previous prime is 6663941. The next prime is 6663961. The reversal of 6663957 is 7593666.

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

It is not a de Polignac number, because 6663957 - 2⁴ = 6663941 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663907) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1794 + ... + 4067.

It is an arithmetic number, because the mean of its divisors is an integer number (1113780).

Almost surely, 2^6663957 is an apocalyptic number.

It is an amenable number.

6663957 is a deficient number, since it is larger than the sum of its proper divisors (2246283).

6663957 is a wasteful number, since it uses less digits than its factorization.

6663957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6243.

The product of its digits is 204120, while the sum is 42.

The square root of 6663957 is about 2581.4641194485. The cubic root of 6663957 is about 188.1817033811.

It can be divided in two parts, 666 and 3957, that multiplied together give a palindrome (2635362).

The spelling of 6663957 in words is "six million, six hundred sixty-three thousand, nine hundred fifty-seven".