86861925877 has 2 divisors, whose sum is σ = 86861925878. Its totient is φ = 86861925876.

The previous prime is 86861925863. The next prime is 86861925893. The reversal of 86861925877 is 77852916868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78463852996 + 8398072881 = 280114^2 + 91641^2 .

It is a cyclic number.

It is not a de Polignac number, because 86861925877 - 2¹¹ = 86861923829 is a prime.

It is a super-2 number, since 2×86861925877² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86861925827) 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 as a sum of consecutive naturals, namely, 43430962938 + 43430962939.

It is an arithmetic number, because the mean of its divisors is an integer number (43430962939).

Almost surely, 2^86861925877 is an apocalyptic number.

It is an amenable number.

86861925877 is a deficient number, since it is larger than the sum of its proper divisors (1).

86861925877 is an equidigital number, since it uses as much as digits as its factorization.

86861925877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81285120, while the sum is 67.

Subtracting from 86861925877 its reverse (77852916868), we obtain a palindrome (9009009009).

The spelling of 86861925877 in words is "eighty-six billion, eight hundred sixty-one million, nine hundred twenty-five thousand, eight hundred seventy-seven".