165936997 has 4 divisors (see below), whose sum is σ = 167405580. Its totient is φ = 164468416.

The previous prime is 165936977. The next prime is 165937001. The reversal of 165936997 is 799639561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799639561 = 7 ⋅114234223.

It can be written as a sum of positive squares in 2 ways, for example, as 12152196 + 153784801 = 3486^2 + 12401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165936997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165936977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734122 + ... + 734347.

It is an arithmetic number, because the mean of its divisors is an integer number (41851395).

Almost surely, 2^165936997 is an apocalyptic number.

It is an amenable number.

165936997 is a deficient number, since it is larger than the sum of its proper divisors (1468583).

165936997 is a wasteful number, since it uses less digits than its factorization.

165936997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468582.

The product of its digits is 2755620, while the sum is 55.

The square root of 165936997 is about 12881.6535041120. The cubic root of 165936997 is about 549.5169279019.

The spelling of 165936997 in words is "one hundred sixty-five million, nine hundred thirty-six thousand, nine hundred ninety-seven".