12003646644 has 72 divisors (see below), whose sum is σ = 34843142880. Its totient is φ = 3446020800.

The previous prime is 12003646609. The next prime is 12003646661. The reversal of 12003646644 is 44664630021.

12003646644 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 3 + 6 + 4 + 6 + 644 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 12003646599 and 12003646608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 790167 + ... + 805214.

It is an arithmetic number, because the mean of its divisors is an integer number (483932540).

Almost surely, 2^12003646644 is an apocalyptic number.

It is an amenable number.

12003646644 is an abundant number, since it is smaller than the sum of its proper divisors (22839496236).

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

12003646644 is a wasteful number, since it uses less digits than its factorization.

12003646644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595421 (or 1595416 counting only the distinct ones).

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

The spelling of 12003646644 in words is "twelve billion, three million, six hundred forty-six thousand, six hundred forty-four".