12347811856 has 20 divisors (see below), whose sum is σ = 24045332652. Its totient is φ = 6142564736.

The previous prime is 12347811829. The next prime is 12347811911. The reversal of 12347811856 is 65811874321.

It can be written as a sum of positive squares in 2 ways, for example, as 8749731600 + 3598080256 = 93540^2 + 59984^2 .

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, 1955575 + ... + 1961878.

Almost surely, 2^12347811856 is an apocalyptic number.

12347811856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12347811856 is a deficient number, since it is larger than the sum of its proper divisors (11697520796).

12347811856 is a wasteful number, since it uses less digits than its factorization.

12347811856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917658 (or 3917652 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The spelling of 12347811856 in words is "twelve billion, three hundred forty-seven million, eight hundred eleven thousand, eight hundred fifty-six".