160661938065721 has 2 divisors, whose sum is σ = 160661938065722. Its totient is φ = 160661938065720.

The previous prime is 160661938065719. The next prime is 160661938065731. The reversal of 160661938065721 is 127560839166061.

It is a happy number.

160661938065721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104572323575721 + 56089614490000 = 10226061^2 + 7489300^2 .

It is a cyclic number.

It is not a de Polignac number, because 160661938065721 - 2¹ = 160661938065719 is a prime.

Together with 160661938065719, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 160661938065721.

It is not a weakly prime, because it can be changed into another prime (160661938065731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80330969032860 + 80330969032861.

It is an arithmetic number, because the mean of its divisors is an integer number (80330969032861).

Almost surely, 2^{160661938065721} is an apocalyptic number.

It is an amenable number.

160661938065721 is a deficient number, since it is larger than the sum of its proper divisors (1).

160661938065721 is an equidigital number, since it uses as much as digits as its factorization.

160661938065721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 160661938065721 in words is "one hundred sixty trillion, six hundred sixty-one billion, nine hundred thirty-eight million, sixty-five thousand, seven hundred twenty-one".