165521512 has 16 divisors (see below), whose sum is σ = 334226340. Its totient is φ = 76394496.

The previous prime is 165521509. The next prime is 165521539. The reversal of 165521512 is 215125561.

165521512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 157602916 + 7918596 = 12554^2 + 2814^2 .

It is a super-2 number, since 2×165521512² = 54794741869532288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795673 + ... + 795880.

Almost surely, 2^165521512 is an apocalyptic number.

It is an amenable number.

165521512 is an abundant number, since it is smaller than the sum of its proper divisors (168704828).

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

165521512 is a wasteful number, since it uses less digits than its factorization.

165521512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591572 (or 1591568 counting only the distinct ones).

The product of its digits is 3000, while the sum is 28.

The square root of 165521512 is about 12865.5163907245. The cubic root of 165521512 is about 549.0579045607.

The spelling of 165521512 in words is "one hundred sixty-five million, five hundred twenty-one thousand, five hundred twelve".