12004012555 has 4 divisors (see below), whose sum is σ = 14404815072. Its totient is φ = 9603210040.

The previous prime is 12004012549. The next prime is 12004012567. The reversal of 12004012555 is 55521040021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55521040021 = 31 ⋅1791001291.

It is not a de Polignac number, because 12004012555 - 2¹¹ = 12004010507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200401251 + ... + 1200401260.

It is an arithmetic number, because the mean of its divisors is an integer number (3601203768).

Almost surely, 2^12004012555 is an apocalyptic number.

12004012555 is a deficient number, since it is larger than the sum of its proper divisors (2400802517).

12004012555 is an equidigital number, since it uses as much as digits as its factorization.

12004012555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400802516.

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 12004012555 its reverse (55521040021), we get a palindrome (67525052576).

The spelling of 12004012555 in words is "twelve billion, four million, twelve thousand, five hundred fifty-five".