12885642646 has 4 divisors (see below), whose sum is σ = 19328463972. Its totient is φ = 6442821322.

The previous prime is 12885642629. The next prime is 12885642667. The reversal of 12885642646 is 64624658821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64624658821 = 196799 ⋅328379.

It is a junction number, because it is equal to n+sod(n) for n = 12885642593 and 12885642602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221410660 + ... + 3221410663.

It is an arithmetic number, because the mean of its divisors is an integer number (4832115993).

Almost surely, 2^12885642646 is an apocalyptic number.

12885642646 is a deficient number, since it is larger than the sum of its proper divisors (6442821326).

12885642646 is an equidigital number, since it uses as much as digits as its factorization.

12885642646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6442821325.

The product of its digits is 4423680, while the sum is 52.

The spelling of 12885642646 in words is "twelve billion, eight hundred eighty-five million, six hundred forty-two thousand, six hundred forty-six".