12136639946 has 4 divisors (see below), whose sum is σ = 18204959922. Its totient is φ = 6068319972.

The previous prime is 12136639939. The next prime is 12136639993. The reversal of 12136639946 is 64993663121.

It is a happy number.

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., 7728343921 + 4408296025 = 87911^2 + 66395^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12136639894 and 12136639903.

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 as a sum of consecutive naturals, namely, 3034159985 + ... + 3034159988.

Almost surely, 2^12136639946 is an apocalyptic number.

12136639946 is a deficient number, since it is larger than the sum of its proper divisors (6068319976).

12136639946 is an equidigital number, since it uses as much as digits as its factorization.

12136639946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6068319975.

The product of its digits is 1259712, while the sum is 50.

The spelling of 12136639946 in words is "twelve billion, one hundred thirty-six million, six hundred thirty-nine thousand, nine hundred forty-six".