165151565 has 8 divisors (see below), whose sum is σ = 199033848. Its totient is φ = 131553280.

The previous prime is 165151559. The next prime is 165151573. The reversal of 165151565 is 565151561.

It can be written as a sum of positive squares in 4 ways, for example, as 3364 + 165148201 = 58^2 + 12851^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165151565 - 2⁸ = 165151309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69716 + ... + 72045.

It is an arithmetic number, because the mean of its divisors is an integer number (24879231).

Almost surely, 2^165151565 is an apocalyptic number.

It is an amenable number.

165151565 is a deficient number, since it is larger than the sum of its proper divisors (33882283).

165151565 is a wasteful number, since it uses less digits than its factorization.

165151565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141999.

The product of its digits is 22500, while the sum is 35.

The square root of 165151565 is about 12851.1308840895. The cubic root of 165151565 is about 548.6485441920.

The spelling of 165151565 in words is "one hundred sixty-five million, one hundred fifty-one thousand, five hundred sixty-five".