12820440356 has 12 divisors (see below), whose sum is σ = 23042143068. Its totient is φ = 6236970912.

The previous prime is 12820440343. The next prime is 12820440403. The reversal of 12820440356 is 65304402821.

It can be written as a sum of positive squares in 2 ways, for example, as 11606614756 + 1213825600 = 107734^2 + 34840^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43312151 + ... + 43312446.

It is an arithmetic number, because the mean of its divisors is an integer number (1920178589).

Almost surely, 2^12820440356 is an apocalyptic number.

It is an amenable number.

12820440356 is a deficient number, since it is larger than the sum of its proper divisors (10221702712).

12820440356 is a wasteful number, since it uses less digits than its factorization.

12820440356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86624638 (or 86624636 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 12820440356 in words is "twelve billion, eight hundred twenty million, four hundred forty thousand, three hundred fifty-six".