86815854509 has 2 divisors, whose sum is σ = 86815854510. Its totient is φ = 86815854508.

The previous prime is 86815854457. The next prime is 86815854511. The reversal of 86815854509 is 90545851868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72685777609 + 14130076900 = 269603^2 + 118870^2 .

It is a cyclic number.

It is not a de Polignac number, because 86815854509 - 2¹² = 86815850413 is a prime.

Together with 86815854511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86815854529) 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, 43407927254 + 43407927255.

It is an arithmetic number, because the mean of its divisors is an integer number (43407927255).

Almost surely, 2^86815854509 is an apocalyptic number.

It is an amenable number.

86815854509 is a deficient number, since it is larger than the sum of its proper divisors (1).

86815854509 is an equidigital number, since it uses as much as digits as its factorization.

86815854509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824000, while the sum is 59.

The spelling of 86815854509 in words is "eighty-six billion, eight hundred fifteen million, eight hundred fifty-four thousand, five hundred nine".