7566666657 has 16 divisors (see below), whose sum is σ = 11009509632. Its totient is φ = 4584421520.

The previous prime is 7566666623. The next prime is 7566666659.

7566666657 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 7566666657 - 2⁶ = 7566666593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7566666657.

It is not an unprimeable number, because it can be changed into a prime (7566666659) 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 15 ways as a sum of consecutive naturals, for example, 76198 + ... + 144704.

It is an arithmetic number, because the mean of its divisors is an integer number (688094352).

Almost surely, 2^7566666657 is an apocalyptic number.

It is an amenable number.

7566666657 is a deficient number, since it is larger than the sum of its proper divisors (3442842975).

7566666657 is a wasteful number, since it uses less digits than its factorization.

7566666657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71868.

The product of its digits is 57153600, while the sum is 60.

The square root of 7566666657 is about 86986.5889491018. The cubic root of 7566666657 is about 1963.2165234197.

The spelling of 7566666657 in words is "seven billion, five hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-seven".