165521052 has 18 divisors (see below), whose sum is σ = 418400528. Its totient is φ = 55173672.

The previous prime is 165521051. The next prime is 165521077. The reversal of 165521052 is 250125561.

165521052 is a `hidden beast` number, since 1 + 6 + 552 + 105 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165521051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2298868 + ... + 2298939.

Almost surely, 2^165521052 is an apocalyptic number.

165521052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165521052 is an abundant number, since it is smaller than the sum of its proper divisors (252879476).

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

165521052 is a wasteful number, since it uses less digits than its factorization.

165521052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597817 (or 4597812 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 165521052 is about 12865.4985134662. The cubic root of 165521052 is about 549.0573959322.

The spelling of 165521052 in words is "one hundred sixty-five million, five hundred twenty-one thousand, fifty-two".