2161620336313 has 2 divisors, whose sum is σ = 2161620336314. Its totient is φ = 2161620336312.

The previous prime is 2161620336289. The next prime is 2161620336319. The reversal of 2161620336313 is 3136330261612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2032486476409 + 129133859904 = 1425653^2 + 359352^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161620336313 - 2³³ = 2153030401721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161620336319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080810168156 + 1080810168157.

It is an arithmetic number, because the mean of its divisors is an integer number (1080810168157).

Almost surely, 2^{2161620336313} is an apocalyptic number.

It is an amenable number.

2161620336313 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161620336313 is an equidigital number, since it uses as much as digits as its factorization.

2161620336313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 37.

Adding to 2161620336313 its reverse (3136330261612), we get a palindrome (5297950597925).

The spelling of 2161620336313 in words is "two trillion, one hundred sixty-one billion, six hundred twenty million, three hundred thirty-six thousand, three hundred thirteen".