86555384561 has 2 divisors, whose sum is σ = 86555384562. Its totient is φ = 86555384560.

The previous prime is 86555384551. The next prime is 86555384627. The reversal of 86555384561 is 16548355568.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56320782400 + 30234602161 = 237320^2 + 173881^2 .

It is a cyclic number.

It is not a de Polignac number, because 86555384561 - 2⁶ = 86555384497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 86555384497 and 86555384506.

It is not a weakly prime, because it can be changed into another prime (86555384551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43277692280 + 43277692281.

It is an arithmetic number, because the mean of its divisors is an integer number (43277692281).

Almost surely, 2^86555384561 is an apocalyptic number.

It is an amenable number.

86555384561 is a deficient number, since it is larger than the sum of its proper divisors (1).

86555384561 is an equidigital number, since it uses as much as digits as its factorization.

86555384561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280000, while the sum is 56.

The spelling of 86555384561 in words is "eighty-six billion, five hundred fifty-five million, three hundred eighty-four thousand, five hundred sixty-one".