161143754489 has 2 divisors, whose sum is σ = 161143754490. Its totient is φ = 161143754488.

The previous prime is 161143754467. The next prime is 161143754549. The reversal of 161143754489 is 984457341161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142042303225 + 19101451264 = 376885^2 + 138208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161143754489 is a prime.

It is a super-2 number, since 2×161143754489² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161143754489.

It is not a weakly prime, because it can be changed into another prime (161143750489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80571877244 + 80571877245.

It is an arithmetic number, because the mean of its divisors is an integer number (80571877245).

Almost surely, 2^161143754489 is an apocalyptic number.

It is an amenable number.

161143754489 is a deficient number, since it is larger than the sum of its proper divisors (1).

161143754489 is an equidigital number, since it uses as much as digits as its factorization.

161143754489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The spelling of 161143754489 in words is "one hundred sixty-one billion, one hundred forty-three million, seven hundred fifty-four thousand, four hundred eighty-nine".