8639946499369 has 4 divisors (see below), whose sum is σ = 8671137642244. Its totient is φ = 8608755356496.

The previous prime is 8639946499337. The next prime is 8639946499397. The reversal of 8639946499369 is 9639946499368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1559089363225 + 7080857136144 = 1248635^2 + 2660988^2 .

It is a cyclic number.

It is not a de Polignac number, because 8639946499369 - 2⁵ = 8639946499337 is a prime.

It is a super-2 number, since 2×8639946499369² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8639946499309) 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, 15595571022 + ... + 15595571575.

It is an arithmetic number, because the mean of its divisors is an integer number (2167784410561).

Almost surely, 2^{8639946499369} is an apocalyptic number.

It is an amenable number.

8639946499369 is a deficient number, since it is larger than the sum of its proper divisors (31191142875).

8639946499369 is a wasteful number, since it uses less digits than its factorization.

8639946499369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31191142874.

The product of its digits is 14693280768, while the sum is 85.

Subtracting 8639946499369 from its reverse (9639946499368), we obtain a palindrome (999999999999).

The spelling of 8639946499369 in words is "eight trillion, six hundred thirty-nine billion, nine hundred forty-six million, four hundred ninety-nine thousand, three hundred sixty-nine".