12172520758646 has 4 divisors (see below), whose sum is σ = 18258781137972. Its totient is φ = 6086260379322.

The previous prime is 12172520758639. The next prime is 12172520758661. The reversal of 12172520758646 is 64685702527121.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 12172520758591 and 12172520758600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3043130189660 + ... + 3043130189663.

It is an arithmetic number, because the mean of its divisors is an integer number (4564695284493).

Almost surely, 2^{12172520758646} is an apocalyptic number.

12172520758646 is a deficient number, since it is larger than the sum of its proper divisors (6086260379326).

12172520758646 is an equidigital number, since it uses as much as digits as its factorization.

12172520758646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086260379325.

The product of its (nonzero) digits is 11289600, while the sum is 56.

The spelling of 12172520758646 in words is "twelve trillion, one hundred seventy-two billion, five hundred twenty million, seven hundred fifty-eight thousand, six hundred forty-six".