868662559 has 2 divisors, whose sum is σ = 868662560. Its totient is φ = 868662558.

The previous prime is 868662547. The next prime is 868662589. The reversal of 868662559 is 955266868.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868662559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868662589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434331279 + 434331280.

It is an arithmetic number, because the mean of its divisors is an integer number (434331280).

Almost surely, 2^868662559 is an apocalyptic number.

868662559 is a deficient number, since it is larger than the sum of its proper divisors (1).

868662559 is an equidigital number, since it uses as much as digits as its factorization.

868662559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6220800, while the sum is 55.

The square root of 868662559 is about 29473.0819392883. The cubic root of 868662559 is about 954.1508342099.

It can be divided in two parts, 868662 and 559, that added together give a triangular number (869221 = T₁₃₁₈).

The spelling of 868662559 in words is "eight hundred sixty-eight million, six hundred sixty-two thousand, five hundred fifty-nine".