20345321064161 has 4 divisors (see below), whose sum is σ = 20346281359152. Its totient is φ = 20344360769172.

The previous prime is 20345321064149. The next prime is 20345321064163. The reversal of 20345321064161 is 16146012354302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20345321064161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20345321064163) 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, 480115715 + ... + 480158088.

It is an arithmetic number, because the mean of its divisors is an integer number (5086570339788).

Almost surely, 2^{20345321064161} is an apocalyptic number.

It is an amenable number.

20345321064161 is a deficient number, since it is larger than the sum of its proper divisors (960294991).

20345321064161 is an equidigital number, since it uses as much as digits as its factorization.

20345321064161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960294990.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 20345321064161 in words is "twenty trillion, three hundred forty-five billion, three hundred twenty-one million, sixty-four thousand, one hundred sixty-one".