165751065 has 12 divisors (see below), whose sum is σ = 287301924. Its totient is φ = 88400544.

The previous prime is 165751063. The next prime is 165751067. The reversal of 165751065 is 560157561.

165751065 is a `hidden beast` number, since 16 + 575 + 10 + 65 = 666.

It is an interprime number because it is at equal distance from previous prime (165751063) and next prime (165751067).

It can be written as a sum of positive squares in 2 ways, for example, as 67026969 + 98724096 = 8187^2 + 9936^2 .

It is not a de Polignac number, because 165751065 - 2¹ = 165751063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165751063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1841634 + ... + 1841723.

It is an arithmetic number, because the mean of its divisors is an integer number (23941827).

Almost surely, 2^165751065 is an apocalyptic number.

165751065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165751065 is a deficient number, since it is larger than the sum of its proper divisors (121550859).

165751065 is a wasteful number, since it uses less digits than its factorization.

165751065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683368 (or 3683365 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 165751065 is about 12874.4345506900. The cubic root of 165751065 is about 549.3116070703.

The spelling of 165751065 in words is "one hundred sixty-five million, seven hundred fifty-one thousand, sixty-five".