86837867561 has 2 divisors, whose sum is σ = 86837867562. Its totient is φ = 86837867560.

The previous prime is 86837867551. The next prime is 86837867563. The reversal of 86837867561 is 16576873868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56228265625 + 30609601936 = 237125^2 + 174956^2 .

It is a cyclic number.

It is not a de Polignac number, because 86837867561 - 2¹⁰ = 86837866537 is a prime.

Together with 86837867563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86837867563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43418933780 + 43418933781.

It is an arithmetic number, because the mean of its divisors is an integer number (43418933781).

Almost surely, 2^86837867561 is an apocalyptic number.

It is an amenable number.

86837867561 is a deficient number, since it is larger than the sum of its proper divisors (1).

86837867561 is an equidigital number, since it uses as much as digits as its factorization.

86837867561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 65.

The spelling of 86837867561 in words is "eighty-six billion, eight hundred thirty-seven million, eight hundred sixty-seven thousand, five hundred sixty-one".