868581989647 has 2 divisors, whose sum is σ = 868581989648. Its totient is φ = 868581989646.

The previous prime is 868581989623. The next prime is 868581989687. The reversal of 868581989647 is 746989185868.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 868581989647 - 2³⁵ = 834222251279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868581989617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434290994823 + 434290994824.

It is an arithmetic number, because the mean of its divisors is an integer number (434290994824).

Almost surely, 2^868581989647 is an apocalyptic number.

868581989647 is a deficient number, since it is larger than the sum of its proper divisors (1).

868581989647 is an equidigital number, since it uses as much as digits as its factorization.

868581989647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1672151040, while the sum is 79.

The spelling of 868581989647 in words is "eight hundred sixty-eight billion, five hundred eighty-one million, nine hundred eighty-nine thousand, six hundred forty-seven".