165956265 has 24 divisors (see below), whose sum is σ = 287958528. Its totient is φ = 88417440.

The previous prime is 165956239. The next prime is 165956281. The reversal of 165956265 is 562659561.

165956265 is a `hidden beast` number, since 16 + 5 + 9 + 5 + 626 + 5 = 666.

It is not a de Polignac number, because 165956265 - 2¹⁹ = 165431977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 165956265.

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 in 23 ways as a sum of consecutive naturals, for example, 77560 + ... + 79670.

It is an arithmetic number, because the mean of its divisors is an integer number (11998272).

Almost surely, 2^165956265 is an apocalyptic number.

165956265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165956265 is a deficient number, since it is larger than the sum of its proper divisors (122002263).

165956265 is a wasteful number, since it uses less digits than its factorization.

165956265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869 (or 3866 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The square root of 165956265 is about 12882.4013677575. The cubic root of 165956265 is about 549.5381963804.

The spelling of 165956265 in words is "one hundred sixty-five million, nine hundred fifty-six thousand, two hundred sixty-five".