7665666 has 16 divisors (see below), whose sum is σ = 15434688. Its totient is φ = 2538000.

The previous prime is 7665641. The next prime is 7665667. The reversal of 7665666 is 6665667.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7665667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3325 + ... + 5136.

It is an arithmetic number, because the mean of its divisors is an integer number (964668).

Almost surely, 2^7665666 is an apocalyptic number.

7665666 is an abundant number, since it is smaller than the sum of its proper divisors (7769022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7665666 is a wasteful number, since it uses less digits than its factorization.

7665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8617.

The product of its digits is 272160, while the sum is 42.

The square root of 7665666 is about 2768.6939159105. The cubic root of 7665666 is about 197.1741440728.

Subtracting from 7665666 its reverse (6665667), we obtain a palindrome (999999).

The spelling of 7665666 in words is "seven million, six hundred sixty-five thousand, six hundred sixty-six".