165746520 has 64 divisors (see below), whose sum is σ = 552492000. Its totient is φ = 44198784.

The previous prime is 165746507. The next prime is 165746521. The reversal of 165746520 is 25647561.

It is a happy number.

165746520 is a `hidden beast` number, since 1 + 6 + 574 + 65 + 20 = 666.

It is a super-2 number, since 2×165746520² = 54943817784220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165746521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75655 + ... + 77814.

Almost surely, 2^165746520 is an apocalyptic number.

165746520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165746520 is an abundant number, since it is smaller than the sum of its proper divisors (386745480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165746520 is a wasteful number, since it uses less digits than its factorization.

165746520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153489 (or 153479 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 165746520 is about 12874.2580368734. The cubic root of 165746520 is about 549.3065861994.

The spelling of 165746520 in words is "one hundred sixty-five million, seven hundred forty-six thousand, five hundred twenty".