12201720661672 has 48 divisors (see below), whose sum is σ = 25030631095380. Its totient is φ = 5556760773120.

The previous prime is 12201720661651. The next prime is 12201720661727. The reversal of 12201720661672 is 27616602710221.

It can be written as a sum of positive squares in 2 ways, for example, as 11203707673636 + 998012988036 = 3347194^2 + 999006^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46549083 + ... + 46810474.

Almost surely, 2^{12201720661672} is an apocalyptic number.

It is an amenable number.

12201720661672 is an abundant number, since it is smaller than the sum of its proper divisors (12828910433708).

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

12201720661672 is a wasteful number, since it uses less digits than its factorization.

12201720661672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93359642 (or 93359607 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 12201720661672 in words is "twelve trillion, two hundred one billion, seven hundred twenty million, six hundred sixty-one thousand, six hundred seventy-two".