86851854721 has 2 divisors, whose sum is σ = 86851854722. Its totient is φ = 86851854720.

The previous prime is 86851854701. The next prime is 86851854737. The reversal of 86851854721 is 12745815868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59102958321 + 27748896400 = 243111^2 + 166580^2 .

It is a cyclic number.

It is not a de Polignac number, because 86851854721 - 2¹⁷ = 86851723649 is a prime.

It is not a weakly prime, because it can be changed into another prime (86851854701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43425927360 + 43425927361.

It is an arithmetic number, because the mean of its divisors is an integer number (43425927361).

Almost surely, 2^86851854721 is an apocalyptic number.

It is an amenable number.

86851854721 is a deficient number, since it is larger than the sum of its proper divisors (1).

86851854721 is an equidigital number, since it uses as much as digits as its factorization.

86851854721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4300800, while the sum is 55.

The spelling of 86851854721 in words is "eighty-six billion, eight hundred fifty-one million, eight hundred fifty-four thousand, seven hundred twenty-one".