7866666687 has 8 divisors (see below), whose sum is σ = 11442424320. Its totient is φ = 4767676760.

The previous prime is 7866666659. The next prime is 7866666727.

7866666687 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7866666687 - 2²⁸ = 7598231231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7866668687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119191887 + ... + 119191952.

It is an arithmetic number, because the mean of its divisors is an integer number (1430303040).

Almost surely, 2^7866666687 is an apocalyptic number.

7866666687 is a deficient number, since it is larger than the sum of its proper divisors (3575757633).

7866666687 is a wasteful number, since it uses less digits than its factorization.

7866666687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238383853.

The product of its digits is 146313216, while the sum is 66.

The square root of 7866666687 is about 88694.2314189598. The cubic root of 7866666687 is about 1988.8265842189.

The spelling of 7866666687 in words is "seven billion, eight hundred sixty-six million, six hundred sixty-six thousand, six hundred eighty-seven".