165513538 has 4 divisors (see below), whose sum is σ = 248270310. Its totient is φ = 82756768.

The previous prime is 165513487. The next prime is 165513553. The reversal of 165513538 is 835315561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 163763209 + 1750329 = 12797^2 + 1323^2 .

It is a super-2 number, since 2×165513538² = 54789462522554888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165513497 and 165513506.

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 as a sum of consecutive naturals, namely, 41378383 + ... + 41378386.

Almost surely, 2^165513538 is an apocalyptic number.

165513538 is a deficient number, since it is larger than the sum of its proper divisors (82756772).

165513538 is an equidigital number, since it uses as much as digits as its factorization.

165513538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82756771.

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

The square root of 165513538 is about 12865.2064888209. The cubic root of 165513538 is about 549.0490874630.

The spelling of 165513538 in words is "one hundred sixty-five million, five hundred thirteen thousand, five hundred thirty-eight".