13156220605601 has 4 divisors (see below), whose sum is σ = 13156228738692. Its totient is φ = 13156212472512.

The previous prime is 13156220605589. The next prime is 13156220605603. The reversal of 13156220605601 is 10650602265131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12912875715601 + 243344890000 = 3593449^2 + 493300^2 .

It is a cyclic number.

It is not a de Polignac number, because 13156220605601 - 2²² = 13156216411297 is a prime.

It is a super-2 number, since 2×13156220605601² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13156220605603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724676 + ... + 5180501.

It is an arithmetic number, because the mean of its divisors is an integer number (3289057184673).

Almost surely, 2^{13156220605601} is an apocalyptic number.

It is an amenable number.

13156220605601 is a deficient number, since it is larger than the sum of its proper divisors (8133091).

13156220605601 is an equidigital number, since it uses as much as digits as its factorization.

13156220605601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8133090.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 13156220605601 in words is "thirteen trillion, one hundred fifty-six billion, two hundred twenty million, six hundred five thousand, six hundred one".