2161641544633 has 4 divisors (see below), whose sum is σ = 2163417750900. Its totient is φ = 2159865338368.

The previous prime is 2161641544597. The next prime is 2161641544637. The reversal of 2161641544633 is 3364451461612.

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 1075800435264 + 1085841109369 = 1037208^2 + 1042037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161641544633 is a prime.

It is a super-2 number, since 2×2161641544633² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161641544637) 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, 888101308 + ... + 888103741.

It is an arithmetic number, because the mean of its divisors is an integer number (540854437725).

Almost surely, 2^{2161641544633} is an apocalyptic number.

It is an amenable number.

2161641544633 is a deficient number, since it is larger than the sum of its proper divisors (1776206267).

2161641544633 is a wasteful number, since it uses less digits than its factorization.

2161641544633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776206266.

The product of its digits is 1244160, while the sum is 46.

The spelling of 2161641544633 in words is "two trillion, one hundred sixty-one billion, six hundred forty-one million, five hundred forty-four thousand, six hundred thirty-three".