868507777 has 2 divisors, whose sum is σ = 868507778. Its totient is φ = 868507776.

The previous prime is 868507763. The next prime is 868507817. The reversal of 868507777 is 777705868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510579216 + 357928561 = 22596^2 + 18919^2 .

It is a cyclic number.

It is not a de Polignac number, because 868507777 - 2⁷ = 868507649 is a prime.

It is not a weakly prime, because it can be changed into another prime (868507177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434253888 + 434253889.

It is an arithmetic number, because the mean of its divisors is an integer number (434253889).

Almost surely, 2^868507777 is an apocalyptic number.

It is an amenable number.

868507777 is a deficient number, since it is larger than the sum of its proper divisors (1).

868507777 is an equidigital number, since it uses as much as digits as its factorization.

868507777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4609920, while the sum is 55.

The square root of 868507777 is about 29470.4560025799. The cubic root of 868507777 is about 954.0941592884.

The spelling of 868507777 in words is "eight hundred sixty-eight million, five hundred seven thousand, seven hundred seventy-seven".