165566512 has 40 divisors (see below), whose sum is σ = 342549504. Its totient is φ = 77335104.

The previous prime is 165566509. The next prime is 165566543. The reversal of 165566512 is 215665561.

It is a super-2 number, since 2×165566512² = 54824539791692288, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10593 + ... + 21055.

Almost surely, 2^165566512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165566512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171274752).

165566512 is an abundant number, since it is smaller than the sum of its proper divisors (176982992).

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

165566512 is a wasteful number, since it uses less digits than its factorization.

165566512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10537 (or 10531 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The square root of 165566512 is about 12867.2651328866. The cubic root of 165566512 is about 549.1076571411.

The spelling of 165566512 in words is "one hundred sixty-five million, five hundred sixty-six thousand, five hundred twelve".