6657668 has 6 divisors (see below), whose sum is σ = 11650926. Its totient is φ = 3328832.

The previous prime is 6657667. The next prime is 6657671. The reversal of 6657668 is 8667566.

It can be written as a sum of positive squares in only one way, i.e., 5914624 + 743044 = 2432^2 + 862^2 .

It is not an unprimeable number, because it can be changed into a prime (6657661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832205 + ... + 832212.

It is an arithmetic number, because the mean of its divisors is an integer number (1941821).

Almost surely, 2^6657668 is an apocalyptic number.

It is an amenable number.

6657668 is a deficient number, since it is larger than the sum of its proper divisors (4993258).

6657668 is a wasteful number, since it uses less digits than its factorization.

6657668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664421 (or 1664419 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

The square root of 6657668 is about 2580.2457247324. The cubic root of 6657668 is about 188.1224869515.

The spelling of 6657668 in words is "six million, six hundred fifty-seven thousand, six hundred sixty-eight".