165649797 has 12 divisors (see below), whose sum is σ = 241642284. Its totient is φ = 109339200.

The previous prime is 165649787. The next prime is 165649817. The reversal of 165649797 is 797946561.

165649797 is a `hidden beast` number, since 1 + 6 + 564 + 9 + 79 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145588356 + 20061441 = 12066^2 + 4479^2 .

It is not a de Polignac number, because 165649797 - 2⁸ = 165649541 is a prime.

It is a super-2 number, since 2×165649797² = 54879710492282418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165649727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90208 + ... + 92025.

It is an arithmetic number, because the mean of its divisors is an integer number (20136857).

Almost surely, 2^165649797 is an apocalyptic number.

It is an amenable number.

165649797 is a deficient number, since it is larger than the sum of its proper divisors (75992487).

165649797 is a wasteful number, since it uses less digits than its factorization.

165649797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182340 (or 182337 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 165649797 is about 12870.5010391981. The cubic root of 165649797 is about 549.1997143342.

The spelling of 165649797 in words is "one hundred sixty-five million, six hundred forty-nine thousand, seven hundred ninety-seven".