2161641544643 has 16 divisors (see below), whose sum is σ = 2629045957824. Its totient is φ = 1734993254400.

The previous prime is 2161641544637. The next prime is 2161641544649. The reversal of 2161641544643 is 3464451461612.

It is an interprime number because it is at equal distance from previous prime (2161641544637) and next prime (2161641544649).

It is not a de Polignac number, because 2161641544643 - 2¹² = 2161641540547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161641544649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46080758 + ... + 46127643.

It is an arithmetic number, because the mean of its divisors is an integer number (164315372364).

Almost surely, 2^{2161641544643} is an apocalyptic number.

2161641544643 is a deficient number, since it is larger than the sum of its proper divisors (467404413181).

2161641544643 is a wasteful number, since it uses less digits than its factorization.

2161641544643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92208622.

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

The spelling of 2161641544643 in words is "two trillion, one hundred sixty-one billion, six hundred forty-one million, five hundred forty-four thousand, six hundred forty-three".