165053551 has 24 divisors (see below), whose sum is σ = 191339120. Its totient is φ = 141129216.

The previous prime is 165053549. The next prime is 165053557. The reversal of 165053551 is 155350561.

It is not a de Polignac number, because 165053551 - 2¹ = 165053549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165053557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1701535 + ... + 1701631.

Almost surely, 2^165053551 is an apocalyptic number.

165053551 is a deficient number, since it is larger than the sum of its proper divisors (26285569).

165053551 is an equidigital number, since it uses as much as digits as its factorization.

165053551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 31.

The square root of 165053551 is about 12847.3168794110. The cubic root of 165053551 is about 548.5399855677.

The spelling of 165053551 in words is "one hundred sixty-five million, fifty-three thousand, five hundred fifty-one".