12123636444 has 72 divisors (see below), whose sum is σ = 33162729600. Its totient is φ = 3865500144.

The previous prime is 12123636443. The next prime is 12123636449. The reversal of 12123636444 is 44463632121.

12123636444 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 3 + 6 + 3 + 644 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12123636399 and 12123636408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123636443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248794 + ... + 293505.

Almost surely, 2^12123636444 is an apocalyptic number.

It is an amenable number.

12123636444 is an abundant number, since it is smaller than the sum of its proper divisors (21039093156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12123636444 is a wasteful number, since it uses less digits than its factorization.

12123636444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542341 (or 542327 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The spelling of 12123636444 in words is "twelve billion, one hundred twenty-three million, six hundred thirty-six thousand, four hundred forty-four".