161663449 has 2 divisors, whose sum is σ = 161663450. Its totient is φ = 161663448.

The previous prime is 161663443. The next prime is 161663461. The reversal of 161663449 is 944366161.

161663449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147185424 + 14478025 = 12132^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 161663449 - 2³ = 161663441 is a prime.

It is a super-2 number, since 2×161663449² = 52270141485151202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161663441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80831724 + 80831725.

It is an arithmetic number, because the mean of its divisors is an integer number (80831725).

Almost surely, 2^161663449 is an apocalyptic number.

It is an amenable number.

161663449 is a deficient number, since it is larger than the sum of its proper divisors (1).

161663449 is an equidigital number, since it uses as much as digits as its factorization.

161663449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 161663449 is about 12714.6942157490. The cubic root of 161663449 is about 544.7584138138.

The spelling of 161663449 in words is "one hundred sixty-one million, six hundred sixty-three thousand, four hundred forty-nine".