2179442753891 has 4 divisors (see below), whose sum is σ = 2347092196512. Its totient is φ = 2011793311272.

The previous prime is 2179442753879. The next prime is 2179442753893. The reversal of 2179442753891 is 1983572449712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2179442753891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2179442753893) 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, 83824721291 + ... + 83824721316.

It is an arithmetic number, because the mean of its divisors is an integer number (586773049128).

Almost surely, 2^{2179442753891} is an apocalyptic number.

2179442753891 is a deficient number, since it is larger than the sum of its proper divisors (167649442621).

2179442753891 is a wasteful number, since it uses less digits than its factorization.

2179442753891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167649442620.

The product of its digits is 30481920, while the sum is 62.

The spelling of 2179442753891 in words is "two trillion, one hundred seventy-nine billion, four hundred forty-two million, seven hundred fifty-three thousand, eight hundred ninety-one".