20180537202161 has 4 divisors (see below), whose sum is σ = 23063471088192. Its totient is φ = 17297603316132.

The previous prime is 20180537202143. The next prime is 20180537202173. The reversal of 20180537202161 is 16120273508102.

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-20180537202161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20180537201161) 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, 1441466943005 + ... + 1441466943018.

It is an arithmetic number, because the mean of its divisors is an integer number (5765867772048).

Almost surely, 2^{20180537202161} is an apocalyptic number.

It is an amenable number.

20180537202161 is a deficient number, since it is larger than the sum of its proper divisors (2882933886031).

20180537202161 is an equidigital number, since it uses as much as digits as its factorization.

20180537202161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882933886030.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 20180537202161 in words is "twenty trillion, one hundred eighty billion, five hundred thirty-seven million, two hundred two thousand, one hundred sixty-one".