12640260556 has 24 divisors (see below), whose sum is σ = 27578750976. Its totient is φ = 4924776720.

The previous prime is 12640260541. The next prime is 12640260583. The reversal of 12640260556 is 65506204621.

12640260556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20519596 + ... + 20520211.

It is an arithmetic number, because the mean of its divisors is an integer number (1149114624).

Almost surely, 2^12640260556 is an apocalyptic number.

It is an amenable number.

12640260556 is an abundant number, since it is smaller than the sum of its proper divisors (14938490420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12640260556 is a wasteful number, since it uses less digits than its factorization.

12640260556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41039829 (or 41039827 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 12640260556 in words is "twelve billion, six hundred forty million, two hundred sixty thousand, five hundred fifty-six".