87636622663669 has 2 divisors, whose sum is σ = 87636622663670. Its totient is φ = 87636622663668.

The previous prime is 87636622663663. The next prime is 87636622663687. The reversal of 87636622663669 is 96636622663678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64796462640625 + 22840160023044 = 8049625^2 + 4779138^2 .

It is a cyclic number.

It is not a de Polignac number, because 87636622663669 - 2⁵ = 87636622663637 is a prime.

It is a super-2 number, since 2×87636622663669² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87636622663595 and 87636622663604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87636622663663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43818311331834 + 43818311331835.

It is an arithmetic number, because the mean of its divisors is an integer number (43818311331835).

Almost surely, 2^{87636622663669} is an apocalyptic number.

It is an amenable number.

87636622663669 is a deficient number, since it is larger than the sum of its proper divisors (1).

87636622663669 is an equidigital number, since it uses as much as digits as its factorization.

87636622663669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5079158784, while the sum is 76.

Subtracting 87636622663669 from its reverse (96636622663678), we obtain a palindrome (9000000000009).

The spelling of 87636622663669 in words is "eighty-seven trillion, six hundred thirty-six billion, six hundred twenty-two million, six hundred sixty-three thousand, six hundred sixty-nine".