7666666666643 has 4 divisors (see below), whose sum is σ = 7671467336160. Its totient is φ = 7661865997128.

The previous prime is 7666666666591. The next prime is 7666666666657. The reversal of 7666666666643 is 3466666666667.

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

It is a cyclic number.

It is not a de Polignac number, because 7666666666643 - 2⁸ = 7666666666387 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (7666666668643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2400332363 + ... + 2400335556.

It is an arithmetic number, because the mean of its divisors is an integer number (1917866834040).

Almost surely, 2^{7666666666643} is an apocalyptic number.

7666666666643 is a deficient number, since it is larger than the sum of its proper divisors (4800669517).

7666666666643 is a wasteful number, since it uses less digits than its factorization.

7666666666643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800669516.

The product of its digits is 5079158784, while the sum is 74.

It can be divided in two parts, 766666666664 and 3, that added together give a palindrome (766666666667).

The spelling of 7666666666643 in words is "seven trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred forty-three".