12002867861 has 4 divisors (see below), whose sum is σ = 12006588300. Its totient is φ = 11999147424.

The previous prime is 12002867857. The next prime is 12002867873. The reversal of 12002867861 is 16876820021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16876820021 = 2141 ⋅7882681.

It can be written as a sum of positive squares in 2 ways, for example, as 9266950225 + 2735917636 = 96265^2 + 52306^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002867861 - 2² = 12002867857 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 (12002867801) by changing a digit.

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, 1855376 + ... + 1861833.

It is an arithmetic number, because the mean of its divisors is an integer number (3001647075).

Almost surely, 2^12002867861 is an apocalyptic number.

It is an amenable number.

12002867861 is a deficient number, since it is larger than the sum of its proper divisors (3720439).

12002867861 is an equidigital number, since it uses as much as digits as its factorization.

12002867861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720438.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 12002867861 in words is "twelve billion, two million, eight hundred sixty-seven thousand, eight hundred sixty-one".