86637278561 has 2 divisors, whose sum is σ = 86637278562. Its totient is φ = 86637278560.

The previous prime is 86637278513. The next prime is 86637278579. The reversal of 86637278561 is 16587273668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82277185600 + 4360092961 = 286840^2 + 66031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86637278561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86637278561.

It is not a weakly prime, because it can be changed into another prime (86637274561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43318639280 + 43318639281.

It is an arithmetic number, because the mean of its divisors is an integer number (43318639281).

Almost surely, 2^86637278561 is an apocalyptic number.

It is an amenable number.

86637278561 is a deficient number, since it is larger than the sum of its proper divisors (1).

86637278561 is an equidigital number, since it uses as much as digits as its factorization.

86637278561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The spelling of 86637278561 in words is "eighty-six billion, six hundred thirty-seven million, two hundred seventy-eight thousand, five hundred sixty-one".