165597449 has 2 divisors, whose sum is σ = 165597450. Its totient is φ = 165597448.

The previous prime is 165597437. The next prime is 165597451. The reversal of 165597449 is 944795561.

165597449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154753600 + 10843849 = 12440^2 + 3293^2 .

It is an emirp because it is prime and its reverse (944795561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165597449 - 2⁴ = 165597433 is a prime.

Together with 165597451, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165597397 and 165597406.

It is not a weakly prime, because it can be changed into another prime (165597469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82798724 + 82798725.

It is an arithmetic number, because the mean of its divisors is an integer number (82798725).

Almost surely, 2^165597449 is an apocalyptic number.

It is an amenable number.

165597449 is a deficient number, since it is larger than the sum of its proper divisors (1).

165597449 is an equidigital number, since it uses as much as digits as its factorization.

165597449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 50.

The square root of 165597449 is about 12868.4672358444. The cubic root of 165597449 is about 549.1418562582.

The spelling of 165597449 in words is "one hundred sixty-five million, five hundred ninety-seven thousand, four hundred forty-nine".