12001015555 has 16 divisors (see below), whose sum is σ = 15376838400. Its totient is φ = 8969815008.

The previous prime is 12001015553. The next prime is 12001015571. The reversal of 12001015555 is 55551010021.

12001015555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12001015555 - 2¹ = 12001015553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12001015553) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1208505 + ... + 1218394.

It is an arithmetic number, because the mean of its divisors is an integer number (961052400).

Almost surely, 2^12001015555 is an apocalyptic number.

12001015555 is a deficient number, since it is larger than the sum of its proper divisors (3375822845).

12001015555 is a wasteful number, since it uses less digits than its factorization.

12001015555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426970.

The product of its (nonzero) digits is 1250, while the sum is 25.

Adding to 12001015555 its reverse (55551010021), we get a palindrome (67552025576).

The spelling of 12001015555 in words is "twelve billion, one million, fifteen thousand, five hundred fifty-five".