86861925869 has 4 divisors (see below), whose sum is σ = 86862589980. Its totient is φ = 86861261760.

The previous prime is 86861925863. The next prime is 86861925877. The reversal of 86861925869 is 96852916868.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36758475625 + 50103450244 = 191725^2 + 223838^2 .

It is a cyclic number.

It is not a de Polignac number, because 86861925869 - 2¹⁶ = 86861860333 is a prime.

It is a super-2 number, since 2×86861925869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 86861925799 and 86861925808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86861925863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63422 + ... + 421599.

It is an arithmetic number, because the mean of its divisors is an integer number (21715647495).

Almost surely, 2^86861925869 is an apocalyptic number.

It is an amenable number.

86861925869 is a deficient number, since it is larger than the sum of its proper divisors (664111).

86861925869 is a wasteful number, since it uses less digits than its factorization.

86861925869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664110.

The product of its digits is 89579520, while the sum is 68.

Subtracting 86861925869 from its reverse (96852916868), we obtain a palindrome (9990990999).

The spelling of 86861925869 in words is "eighty-six billion, eight hundred sixty-one million, nine hundred twenty-five thousand, eight hundred sixty-nine".