7566661 has 4 divisors (see below), whose sum is σ = 7589452. Its totient is φ = 7543872.

The previous prime is 7566659. The next prime is 7566703. The reversal of 7566661 is 1666657.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1366561 + 6200100 = 1169^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 7566661 - 2¹ = 7566659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7566661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7566641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10890 + ... + 11563.

It is an arithmetic number, because the mean of its divisors is an integer number (1897363).

Almost surely, 2^7566661 is an apocalyptic number.

It is an amenable number.

7566661 is a deficient number, since it is larger than the sum of its proper divisors (22791).

7566661 is a wasteful number, since it uses less digits than its factorization.

7566661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22790.

The product of its digits is 45360, while the sum is 37.

The square root of 7566661 is about 2750.7564414175. The cubic root of 7566661 is about 196.3216034172.

The spelling of 7566661 in words is "seven million, five hundred sixty-six thousand, six hundred sixty-one".