12561002017166 has 64 divisors (see below), whose sum is σ = 20397900556800. Its totient is φ = 5779439410176.

The previous prime is 12561002017133. The next prime is 12561002017169. The reversal of 12561002017166 is 66171020016521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561002017169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429524141 + ... + 429553383.

It is an arithmetic number, because the mean of its divisors is an integer number (318717196200).

Almost surely, 2^{12561002017166} is an apocalyptic number.

12561002017166 is a deficient number, since it is larger than the sum of its proper divisors (7836898539634).

12561002017166 is a wasteful number, since it uses less digits than its factorization.

12561002017166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30473.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 12561002017166 in words is "twelve trillion, five hundred sixty-one billion, two million, seventeen thousand, one hundred sixty-six".