2161171947449 has 8 divisors (see below), whose sum is σ = 2274932006880. Its totient is φ = 2047413304800.

The previous prime is 2161171947439. The next prime is 2161171947461. The reversal of 2161171947449 is 9447491711612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161171947449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2161171947394 and 2161171947403.

It is not an unprimeable number, because it can be changed into a prime (2161171947439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4443029 + ... + 4905389.

It is an arithmetic number, because the mean of its divisors is an integer number (284366500860).

Almost surely, 2^{2161171947449} is an apocalyptic number.

It is an amenable number.

2161171947449 is a deficient number, since it is larger than the sum of its proper divisors (113760059431).

2161171947449 is a wasteful number, since it uses less digits than its factorization.

2161171947449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708391.

The product of its digits is 3048192, while the sum is 56.

The spelling of 2161171947449 in words is "two trillion, one hundred sixty-one billion, one hundred seventy-one million, nine hundred forty-seven thousand, four hundred forty-nine".