7666666 has 8 divisors (see below), whose sum is σ = 13142880. Its totient is φ = 3285708.

The previous prime is 7666661. The next prime is 7666667. The reversal of 7666666 is 6666667.

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

7666666 is a modest number, since divided by 6666 gives 766 as remainder.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (7666661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273796 + ... + 273823.

It is an arithmetic number, because the mean of its divisors is an integer number (1642860).

Almost surely, 2^7666666 is an apocalyptic number.

7666666 is a deficient number, since it is larger than the sum of its proper divisors (5476214).

7666666 is a wasteful number, since it uses less digits than its factorization.

7666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547628.

The product of its digits is 326592, while the sum is 43.

The square root of 7666666 is about 2768.8745005868. The cubic root of 7666666 is about 197.1827176079.

Subtracting from 7666666 its reverse (6666667), we obtain a palindrome (999999).

The spelling of 7666666 in words is "seven million, six hundred sixty-six thousand, six hundred sixty-six".