12138944602 has 4 divisors (see below), whose sum is σ = 18208416906. Its totient is φ = 6069472300.

The previous prime is 12138944533. The next prime is 12138944603. The reversal of 12138944602 is 20644983121.

12138944602 is digitally balanced in base 5, 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.

It can be written as a sum of positive squares in only one way, i.e., 8979268081 + 3159676521 = 94759^2 + 56211^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12138944603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3034736149 + ... + 3034736152.

Almost surely, 2^12138944602 is an apocalyptic number.

12138944602 is a deficient number, since it is larger than the sum of its proper divisors (6069472304).

12138944602 is an equidigital number, since it uses as much as digits as its factorization.

12138944602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6069472303.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 12138944602 in words is "twelve billion, one hundred thirty-eight million, nine hundred forty-four thousand, six hundred two".