766606666 has 24 divisors (see below), whose sum is σ = 1368766080. Its totient is φ = 320903352.

The previous prime is 766606651. The next prime is 766606669. The reversal of 766606666 is 666606667.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (766606669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86746 + ... + 95173.

It is an arithmetic number, because the mean of its divisors is an integer number (57031920).

Almost surely, 2^766606666 is an apocalyptic number.

766606666 is a deficient number, since it is larger than the sum of its proper divisors (602159414).

766606666 is a wasteful number, since it uses less digits than its factorization.

766606666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181978 (or 181971 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 49.

The square root of 766606666 is about 27687.6627038109. The cubic root of 766606666 is about 915.2172500154.

Subtracting from 766606666 its reverse (666606667), we obtain a palindrome (99999999).

The spelling of 766606666 in words is "seven hundred sixty-six million, six hundred six thousand, six hundred sixty-six".