161637524449 has 2 divisors, whose sum is σ = 161637524450. Its totient is φ = 161637524448.

The previous prime is 161637524393. The next prime is 161637524519. The reversal of 161637524449 is 944425736161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153375623424 + 8261901025 = 391632^2 + 90895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161637524449 is a prime.

It is a super-2 number, since 2×161637524449² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161637524396 and 161637524405.

It is not a weakly prime, because it can be changed into another prime (161637524149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80818762224 + 80818762225.

It is an arithmetic number, because the mean of its divisors is an integer number (80818762225).

Almost surely, 2^161637524449 is an apocalyptic number.

It is an amenable number.

161637524449 is a deficient number, since it is larger than the sum of its proper divisors (1).

161637524449 is an equidigital number, since it uses as much as digits as its factorization.

161637524449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 52.

The spelling of 161637524449 in words is "one hundred sixty-one billion, six hundred thirty-seven million, five hundred twenty-four thousand, four hundred forty-nine".