868686877 has 2 divisors, whose sum is σ = 868686878. Its totient is φ = 868686876.

The previous prime is 868686869. The next prime is 868686899. The reversal of 868686877 is 778686868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807753241 + 60933636 = 28421^2 + 7806^2 .

It is a cyclic number.

It is not a de Polignac number, because 868686877 - 2³ = 868686869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868686857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434343438 + 434343439.

It is an arithmetic number, because the mean of its divisors is an integer number (434343439).

Almost surely, 2^868686877 is an apocalyptic number.

It is an amenable number.

868686877 is a deficient number, since it is larger than the sum of its proper divisors (1).

868686877 is an equidigital number, since it uses as much as digits as its factorization.

868686877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43352064, while the sum is 64.

The square root of 868686877 is about 29473.4944823311. The cubic root of 868686877 is about 954.1597378681.

Subtracting from 868686877 its reverse (778686868), we obtain a palindrome (90000009).

The spelling of 868686877 in words is "eight hundred sixty-eight million, six hundred eighty-six thousand, eight hundred seventy-seven".