12800000005 has 12 divisors (see below), whose sum is σ = 16632427140. Its totient is φ = 9452307072.

The previous prime is 12799999981. The next prime is 12800000021. The reversal of 12800000005 is 50000000821.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2781191169 + 10018808836 = 52737^2 + 100094^2 .

It is not a de Polignac number, because 12800000005 - 2¹⁵ = 12799967237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7573120 + ... + 7574809.

It is an arithmetic number, because the mean of its divisors is an integer number (1386035595).

Almost surely, 2^12800000005 is an apocalyptic number.

It is an amenable number.

12800000005 is a deficient number, since it is larger than the sum of its proper divisors (3832427135).

12800000005 is a wasteful number, since it uses less digits than its factorization.

12800000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15147960 (or 15147947 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 12800000005 its reverse (50000000821), we get a palindrome (62800000826).

It can be divided in two parts, 1280000000 and 5, that multiplied together give a square (6400000000 = 80000²).

The spelling of 12800000005 in words is "twelve billion, eight hundred million, five", and thus it is an aban number.