161616149281 has 2 divisors, whose sum is σ = 161616149282. Its totient is φ = 161616149280.

The previous prime is 161616149267. The next prime is 161616149327. The reversal of 161616149281 is 182941616161.

It is an a-pointer prime, because the next prime (161616149327) can be obtained adding 161616149281 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160160040000 + 1456109281 = 400200^2 + 38159^2 .

It is a cyclic number.

It is not a de Polignac number, because 161616149281 - 2⁵ = 161616149249 is a prime.

It is a super-2 number, since 2×161616149281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161616149251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80808074640 + 80808074641.

It is an arithmetic number, because the mean of its divisors is an integer number (80808074641).

Almost surely, 2^161616149281 is an apocalyptic number.

It is an amenable number.

161616149281 is a deficient number, since it is larger than the sum of its proper divisors (1).

161616149281 is an equidigital number, since it uses as much as digits as its factorization.

161616149281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The spelling of 161616149281 in words is "one hundred sixty-one billion, six hundred sixteen million, one hundred forty-nine thousand, two hundred eighty-one".