2177538268161 has 4 divisors (see below), whose sum is σ = 2903384357552. Its totient is φ = 1451692178772.

The previous prime is 2177538268151. The next prime is 2177538268207. The reversal of 2177538268161 is 1618628357712.

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 not a de Polignac number, because 2177538268161 - 2²⁵ = 2177504713729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2177538268141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362923044691 + ... + 362923044696.

It is an arithmetic number, because the mean of its divisors is an integer number (725846089388).

Almost surely, 2^{2177538268161} is an apocalyptic number.

It is an amenable number.

2177538268161 is a deficient number, since it is larger than the sum of its proper divisors (725846089391).

2177538268161 is an equidigital number, since it uses as much as digits as its factorization.

2177538268161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725846089390.

The product of its digits is 6773760, while the sum is 57.

The spelling of 2177538268161 in words is "two trillion, one hundred seventy-seven billion, five hundred thirty-eight million, two hundred sixty-eight thousand, one hundred sixty-one".