165767897 has 4 divisors (see below), whose sum is σ = 165834420. Its totient is φ = 165701376.

The previous prime is 165767887. The next prime is 165767911. The reversal of 165767897 is 798767561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798767561 = 29 ⋅27543709.

It can be written as a sum of positive squares in 2 ways, for example, as 53640976 + 112126921 = 7324^2 + 10589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165767897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165767887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29372 + ... + 34557.

It is an arithmetic number, because the mean of its divisors is an integer number (41458605).

Almost surely, 2^165767897 is an apocalyptic number.

It is an amenable number.

165767897 is a deficient number, since it is larger than the sum of its proper divisors (66523).

165767897 is an equidigital number, since it uses as much as digits as its factorization.

165767897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66522.

The product of its digits is 4445280, while the sum is 56.

The square root of 165767897 is about 12875.0882327074. The cubic root of 165767897 is about 549.3302006160.

The spelling of 165767897 in words is "one hundred sixty-five million, seven hundred sixty-seven thousand, eight hundred ninety-seven".