87865644793 has 2 divisors, whose sum is σ = 87865644794. Its totient is φ = 87865644792.

The previous prime is 87865644791. The next prime is 87865644847. The reversal of 87865644793 is 39744656878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86343708649 + 1521936144 = 293843^2 + 39012^2 .

It is a cyclic number.

It is not a de Polignac number, because 87865644793 - 2¹ = 87865644791 is a prime.

Together with 87865644791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87865644791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43932822396 + 43932822397.

It is an arithmetic number, because the mean of its divisors is an integer number (43932822397).

Almost surely, 2^87865644793 is an apocalyptic number.

It is an amenable number.

87865644793 is a deficient number, since it is larger than the sum of its proper divisors (1).

87865644793 is an equidigital number, since it uses as much as digits as its factorization.

87865644793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243855360, while the sum is 67.

The spelling of 87865644793 in words is "eighty-seven billion, eight hundred sixty-five million, six hundred forty-four thousand, seven hundred ninety-three".