2643036566161 has 4 divisors (see below), whose sum is σ = 2643205996324. Its totient is φ = 2642867136000.

The previous prime is 2643036566143. The next prime is 2643036566189. The reversal of 2643036566161 is 1616656303462.

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 2596996710400 + 46039855761 = 1611520^2 + 214569^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643036566161 - 2⁷ = 2643036566033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2643036266161) 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, 84691680 + ... + 84722881.

It is an arithmetic number, because the mean of its divisors is an integer number (660801499081).

Almost surely, 2^{2643036566161} is an apocalyptic number.

It is an amenable number.

2643036566161 is a deficient number, since it is larger than the sum of its proper divisors (169430163).

2643036566161 is a wasteful number, since it uses less digits than its factorization.

2643036566161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169430162.

The product of its (nonzero) digits is 2799360, while the sum is 49.

The spelling of 2643036566161 in words is "two trillion, six hundred forty-three billion, thirty-six million, five hundred sixty-six thousand, one hundred sixty-one".