165855258 has 12 divisors (see below), whose sum is σ = 359353098. Its totient is φ = 55285080.

The previous prime is 165855251. The next prime is 165855259. The reversal of 165855258 is 852558561.

165855258 is a `hidden beast` number, since 16 + 585 + 5 + 2 + 58 = 666.

It can be written as a sum of positive squares in only one way, i.e., 88115769 + 77739489 = 9387^2 + 8817^2 .

It is not an unprimeable number, because it can be changed into a prime (165855251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4607073 + ... + 4607108.

Almost surely, 2^165855258 is an apocalyptic number.

165855258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165855258 is an abundant number, since it is smaller than the sum of its proper divisors (193497840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165855258 is a wasteful number, since it uses less digits than its factorization.

165855258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9214189 (or 9214186 counting only the distinct ones).

The product of its digits is 480000, while the sum is 45.

The square root of 165855258 is about 12878.4804227828. The cubic root of 165855258 is about 549.4266841302.

The spelling of 165855258 in words is "one hundred sixty-five million, eight hundred fifty-five thousand, two hundred fifty-eight".