7866668687 has 2 divisors, whose sum is σ = 7866668688. Its totient is φ = 7866668686.

The previous prime is 7866668651. The next prime is 7866668737. The reversal of 7866668687 is 7868666687.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7866668687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7866658687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3933334343 + 3933334344.

It is an arithmetic number, because the mean of its divisors is an integer number (3933334344).

Almost surely, 2^7866668687 is an apocalyptic number.

7866668687 is a deficient number, since it is larger than the sum of its proper divisors (1).

7866668687 is an equidigital number, since it uses as much as digits as its factorization.

7866668687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 195084288, while the sum is 68.

The square root of 7866668687 is about 88694.2426936495. The cubic root of 7866668687 is about 1988.8267527635.

The spelling of 7866668687 in words is "seven billion, eight hundred sixty-six million, six hundred sixty-eight thousand, six hundred eighty-seven".