7666605 has 12 divisors (see below), whose sum is σ = 13288860. Its totient is φ = 4088832.

The previous prime is 7666597. The next prime is 7666619. The reversal of 7666605 is 5066667.

It can be written as a sum of positive squares in 2 ways, for example, as 5745609 + 1920996 = 2397^2 + 1386^2 .

It is not a de Polignac number, because 7666605 - 2³ = 7666597 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7666605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85140 + ... + 85229.

It is an arithmetic number, because the mean of its divisors is an integer number (1107405).

Almost surely, 2^7666605 is an apocalyptic number.

It is an amenable number.

7666605 is a deficient number, since it is larger than the sum of its proper divisors (5622255).

7666605 is a wasteful number, since it uses less digits than its factorization.

7666605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170380 (or 170377 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 7666605 is about 2768.8634852589. The cubic root of 7666605 is about 197.1821946436.

The spelling of 7666605 in words is "seven million, six hundred sixty-six thousand, six hundred five".