2161641544634 has 48 divisors (see below), whose sum is σ = 3850449216936. Its totient is φ = 904084346880.

The previous prime is 2161641544597. The next prime is 2161641544637. The reversal of 2161641544634 is 4364451461612.

It can be written as a sum of positive squares in 4 ways, for example, as 616455811609 + 1545185733025 = 785147^2 + 1243055^2 .

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 23 ways as a sum of consecutive naturals, for example, 112919 + ... + 2082314.

Almost surely, 2^{2161641544634} is an apocalyptic number.

2161641544634 is a deficient number, since it is larger than the sum of its proper divisors (1688807672302).

2161641544634 is a wasteful number, since it uses less digits than its factorization.

2161641544634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195583 (or 2195572 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 47.

The spelling of 2161641544634 in words is "two trillion, one hundred sixty-one billion, six hundred forty-one million, five hundred forty-four thousand, six hundred thirty-four".