12205655646 has 8 divisors (see below), whose sum is σ = 24411311304. Its totient is φ = 4068551880.

The previous prime is 12205655639. The next prime is 12205655669. The reversal of 12205655646 is 64655650221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

12205655646 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12205655598 and 12205655607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1017137965 + ... + 1017137976.

It is an arithmetic number, because the mean of its divisors is an integer number (3051413913).

Almost surely, 2^12205655646 is an apocalyptic number.

12205655646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12205655646 is a wasteful number, since it uses less digits than its factorization.

12205655646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034275946.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 12205655646 in words is "twelve billion, two hundred five million, six hundred fifty-five thousand, six hundred forty-six".