160558921981 has 2 divisors, whose sum is σ = 160558921982. Its totient is φ = 160558921980.

The previous prime is 160558921883. The next prime is 160558921993. The reversal of 160558921981 is 189129855061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159313537881 + 1245384100 = 399141^2 + 35290^2 .

It is a cyclic number.

It is not a de Polignac number, because 160558921981 - 2²¹ = 160556824829 is a prime.

It is a super-2 number, since 2×160558921981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (160558921181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80279460990 + 80279460991.

It is an arithmetic number, because the mean of its divisors is an integer number (80279460991).

Almost surely, 2^160558921981 is an apocalyptic number.

It is an amenable number.

160558921981 is a deficient number, since it is larger than the sum of its proper divisors (1).

160558921981 is an equidigital number, since it uses as much as digits as its factorization.

160558921981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 55.

The spelling of 160558921981 in words is "one hundred sixty billion, five hundred fifty-eight million, nine hundred twenty-one thousand, nine hundred eighty-one".