7666111 has 4 divisors (see below), whose sum is σ = 7671712. Its totient is φ = 7660512.

The previous prime is 7666103. The next prime is 7666117. The reversal of 7666111 is 1116667.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1116667 = 43 ⋅25969.

It is a cyclic number.

It is not a de Polignac number, because 7666111 - 2³ = 7666103 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 7666111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7666117) 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 3 ways as a sum of consecutive naturals, for example, 775 + ... + 3991.

It is an arithmetic number, because the mean of its divisors is an integer number (1917928).

Almost surely, 2^7666111 is an apocalyptic number.

7666111 is a deficient number, since it is larger than the sum of its proper divisors (5601).

7666111 is a wasteful number, since it uses less digits than its factorization.

7666111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5600.

The product of its digits is 1512, while the sum is 28.

The square root of 7666111 is about 2768.7742775459. The cubic root of 7666111 is about 197.1779593880.

It can be divided in two parts, 7666 and 111, that added together give a palindrome (7777).

The spelling of 7666111 in words is "seven million, six hundred sixty-six thousand, one hundred eleven".