2161654336241 has 8 divisors (see below), whose sum is σ = 2188352748960. Its totient is φ = 2135009482848.

The previous prime is 2161654336189. The next prime is 2161654336273. The reversal of 2161654336241 is 1426334561612.

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-2161654336241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2161654336192 and 2161654336201.

It is not an unprimeable number, because it can be changed into a prime (2161354336241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13308611 + ... + 13470056.

It is an arithmetic number, because the mean of its divisors is an integer number (273544093620).

Almost surely, 2^{2161654336241} is an apocalyptic number.

It is an amenable number.

2161654336241 is a deficient number, since it is larger than the sum of its proper divisors (26698412719).

2161654336241 is an equidigital number, since it uses as much as digits as its factorization.

2161654336241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26779663.

The product of its digits is 622080, while the sum is 44.

Adding to 2161654336241 its reverse (1426334561612), we get a palindrome (3587988897853).

The spelling of 2161654336241 in words is "two trillion, one hundred sixty-one billion, six hundred fifty-four million, three hundred thirty-six thousand, two hundred forty-one".