165265351 has 4 divisors (see below), whose sum is σ = 167593104. Its totient is φ = 162937600.

The previous prime is 165265339. The next prime is 165265361. The reversal of 165265351 is 153562561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 153562561 = 31 ⋅4953631.

It is a cyclic number.

It is not a de Polignac number, because 165265351 - 2⁵ = 165265319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165265361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163770 + ... + 1163911.

It is an arithmetic number, because the mean of its divisors is an integer number (41898276).

Almost surely, 2^165265351 is an apocalyptic number.

165265351 is a deficient number, since it is larger than the sum of its proper divisors (2327753).

165265351 is an equidigital number, since it uses as much as digits as its factorization.

165265351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327752.

The product of its digits is 27000, while the sum is 34.

The square root of 165265351 is about 12855.5572030154. The cubic root of 165265351 is about 548.7745177513.

The spelling of 165265351 in words is "one hundred sixty-five million, two hundred sixty-five thousand, three hundred fifty-one".