7657666 has 8 divisors (see below), whose sum is σ = 11985984. Its totient is φ = 3662340.

The previous prime is 7657613. The next prime is 7657679. The reversal of 7657666 is 6667567.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83190 + ... + 83281.

It is an arithmetic number, because the mean of its divisors is an integer number (1498248).

Almost surely, 2^7657666 is an apocalyptic number.

7657666 is a deficient number, since it is larger than the sum of its proper divisors (4328318).

7657666 is a wasteful number, since it uses less digits than its factorization.

7657666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166496.

The product of its digits is 317520, while the sum is 43.

The square root of 7657666 is about 2767.2488142558. The cubic root of 7657666 is about 197.1055289343.

Subtracting from 7657666 its reverse (6667567), we obtain a palindrome (990099).

The spelling of 7657666 in words is "seven million, six hundred fifty-seven thousand, six hundred sixty-six".