12004012556 has 6 divisors (see below), whose sum is σ = 21007021980. Its totient is φ = 6002006276.

The previous prime is 12004012549. The next prime is 12004012567. The reversal of 12004012556 is 65521040021.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1500501566 + ... + 1500501573.

It is an arithmetic number, because the mean of its divisors is an integer number (3501170330).

Almost surely, 2^12004012556 is an apocalyptic number.

It is an amenable number.

12004012556 is a deficient number, since it is larger than the sum of its proper divisors (9003009424).

12004012556 is a wasteful number, since it uses less digits than its factorization.

12004012556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001003143 (or 3001003141 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 12004012556 its reverse (65521040021), we get a palindrome (77525052577).

The spelling of 12004012556 in words is "twelve billion, four million, twelve thousand, five hundred fifty-six".