161637524149 has 2 divisors, whose sum is σ = 161637524150. Its totient is φ = 161637524148.

The previous prime is 161637524123. The next prime is 161637524263. The reversal of 161637524149 is 941425736161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135429152049 + 26208372100 = 368007^2 + 161890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161637524149 is a prime.

It is a super-2 number, since 2×161637524149² (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 (161637524449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80818762074 + 80818762075.

It is an arithmetic number, because the mean of its divisors is an integer number (80818762075).

Almost surely, 2^161637524149 is an apocalyptic number.

It is an amenable number.

161637524149 is a deficient number, since it is larger than the sum of its proper divisors (1).

161637524149 is an equidigital number, since it uses as much as digits as its factorization.

161637524149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The spelling of 161637524149 in words is "one hundred sixty-one billion, six hundred thirty-seven million, five hundred twenty-four thousand, one hundred forty-nine".