20013123656163 has 32 divisors (see below), whose sum is σ = 29464608337920. Its totient is φ = 11981450132640.

The previous prime is 20013123656159. The next prime is 20013123656177. The reversal of 20013123656163 is 36165632131002.

It is not a de Polignac number, because 20013123656163 - 2² = 20013123656159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20013123656063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20444970 + ... + 21401472.

It is an arithmetic number, because the mean of its divisors is an integer number (920769010560).

Almost surely, 2^{20013123656163} is an apocalyptic number.

20013123656163 is a deficient number, since it is larger than the sum of its proper divisors (9451484681757).

20013123656163 is a wasteful number, since it uses less digits than its factorization.

20013123656163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964239.

The product of its (nonzero) digits is 116640, while the sum is 39.

Adding to 20013123656163 its reverse (36165632131002), we get a palindrome (56178755787165).

The spelling of 20013123656163 in words is "twenty trillion, thirteen billion, one hundred twenty-three million, six hundred fifty-six thousand, one hundred sixty-three".