2775605564161 has 4 divisors (see below), whose sum is σ = 2775610386900. Its totient is φ = 2775600741424.

The previous prime is 2775605564153. The next prime is 2775605564279. The reversal of 2775605564161 is 1614655065772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2751617440000 + 23988124161 = 1658800^2 + 154881^2 .

It is a cyclic number.

It is not a de Polignac number, because 2775605564161 - 2³ = 2775605564153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2775605564141) 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, 1409266 + ... + 2745403.

It is an arithmetic number, because the mean of its divisors is an integer number (693902596725).

Almost surely, 2^{2775605564161} is an apocalyptic number.

It is an amenable number.

2775605564161 is a deficient number, since it is larger than the sum of its proper divisors (4822739).

2775605564161 is an equidigital number, since it uses as much as digits as its factorization.

2775605564161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4822738.

The product of its (nonzero) digits is 10584000, while the sum is 55.

The spelling of 2775605564161 in words is "two trillion, seven hundred seventy-five billion, six hundred five million, five hundred sixty-four thousand, one hundred sixty-one".