12071999815 has 4 divisors (see below), whose sum is σ = 14486399784. Its totient is φ = 9657599848.

The previous prime is 12071999813. The next prime is 12071999827. The reversal of 12071999815 is 51899917021.

12071999815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51899917021 = 224569 ⋅231109.

It is a cyclic number.

It is not a de Polignac number, because 12071999815 - 2¹ = 12071999813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12071999813) 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 3 ways as a sum of consecutive naturals, for example, 1207199977 + ... + 1207199986.

It is an arithmetic number, because the mean of its divisors is an integer number (3621599946).

Almost surely, 2^12071999815 is an apocalyptic number.

12071999815 is a deficient number, since it is larger than the sum of its proper divisors (2414399969).

12071999815 is an equidigital number, since it uses as much as digits as its factorization.

12071999815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414399968.

The product of its (nonzero) digits is 408240, while the sum is 52.

The spelling of 12071999815 in words is "twelve billion, seventy-one million, nine hundred ninety-nine thousand, eight hundred fifteen".