86726788669 has 2 divisors, whose sum is σ = 86726788670. Its totient is φ = 86726788668.

The previous prime is 86726788667. The next prime is 86726788691. The reversal of 86726788669 is 96688762768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43508536569 + 43218252100 = 208587^2 + 207890^2 .

It is a cyclic number.

It is not a de Polignac number, because 86726788669 - 2¹ = 86726788667 is a prime.

It is a super-2 number, since 2×86726788669² (a number of 23 digits) contains 22 as substring.

Together with 86726788667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86726788667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43363394334 + 43363394335.

It is an arithmetic number, because the mean of its divisors is an integer number (43363394335).

Almost surely, 2^86726788669 is an apocalyptic number.

It is an amenable number.

86726788669 is a deficient number, since it is larger than the sum of its proper divisors (1).

86726788669 is an equidigital number, since it uses as much as digits as its factorization.

86726788669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 585252864, while the sum is 73.

The spelling of 86726788669 in words is "eighty-six billion, seven hundred twenty-six million, seven hundred eighty-eight thousand, six hundred sixty-nine".