165664555 has 8 divisors (see below), whose sum is σ = 227197152. Its totient is φ = 113598528.

The previous prime is 165664547. The next prime is 165664567. The reversal of 165664555 is 555466561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165664555 - 2³ = 165664547 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2366602 + ... + 2366671.

It is an arithmetic number, because the mean of its divisors is an integer number (28399644).

Almost surely, 2^165664555 is an apocalyptic number.

165664555 is a deficient number, since it is larger than the sum of its proper divisors (61532597).

165664555 is an equidigital number, since it uses as much as digits as its factorization.

165664555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733285.

The product of its digits is 540000, while the sum is 43.

The square root of 165664555 is about 12871.0743529823. The cubic root of 165664555 is about 549.2160235376.

The spelling of 165664555 in words is "one hundred sixty-five million, six hundred sixty-four thousand, five hundred fifty-five".