87865644847 has 2 divisors, whose sum is σ = 87865644848. Its totient is φ = 87865644846.

The previous prime is 87865644793. The next prime is 87865644863. The reversal of 87865644847 is 74844656878.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87865644847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87865644877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43932822423 + 43932822424.

It is an arithmetic number, because the mean of its divisors is an integer number (43932822424).

Almost surely, 2^87865644847 is an apocalyptic number.

87865644847 is a deficient number, since it is larger than the sum of its proper divisors (1).

87865644847 is an equidigital number, since it uses as much as digits as its factorization.

87865644847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 289013760, while the sum is 67.

The spelling of 87865644847 in words is "eighty-seven billion, eight hundred sixty-five million, six hundred forty-four thousand, eight hundred forty-seven".