7165666 has 4 divisors (see below), whose sum is σ = 10748502. Its totient is φ = 3582832.

The previous prime is 7165663. The next prime is 7165699. The reversal of 7165666 is 6665617.

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 only one way, i.e., 5900041 + 1265625 = 2429^2 + 1125^2 .

It is not an unprimeable number, because it can be changed into a prime (7165661) 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 as a sum of consecutive naturals, namely, 1791415 + ... + 1791418.

Almost surely, 2^7165666 is an apocalyptic number.

7165666 is a deficient number, since it is larger than the sum of its proper divisors (3582836).

7165666 is a wasteful number, since it uses less digits than its factorization.

7165666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3582835.

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

The square root of 7165666 is about 2676.8761644873. The cubic root of 7165666 is about 192.7904515108.

The spelling of 7165666 in words is "seven million, one hundred sixty-five thousand, six hundred sixty-six".