86856029881 has 2 divisors, whose sum is σ = 86856029882. Its totient is φ = 86856029880.

The previous prime is 86856029863. The next prime is 86856029903. The reversal of 86856029881 is 18892065868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80462428281 + 6393601600 = 283659^2 + 79960^2 .

It is a cyclic number.

It is not a de Polignac number, because 86856029881 - 2⁵ = 86856029849 is a prime.

It is a super-2 number, since 2×86856029881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86856029851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43428014940 + 43428014941.

It is an arithmetic number, because the mean of its divisors is an integer number (43428014941).

Almost surely, 2^86856029881 is an apocalyptic number.

It is an amenable number.

86856029881 is a deficient number, since it is larger than the sum of its proper divisors (1).

86856029881 is an equidigital number, since it uses as much as digits as its factorization.

86856029881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13271040, while the sum is 61.

The spelling of 86856029881 in words is "eighty-six billion, eight hundred fifty-six million, twenty-nine thousand, eight hundred eighty-one".