165670555 has 4 divisors (see below), whose sum is σ = 198804672. Its totient is φ = 132536440.

The previous prime is 165670537. The next prime is 165670577. The reversal of 165670555 is 555076561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555076561 = 13 ⋅42698197.

It is not a de Polignac number, because 165670555 - 2¹⁷ = 165539483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16567051 + ... + 16567060.

It is an arithmetic number, because the mean of its divisors is an integer number (49701168).

Almost surely, 2^165670555 is an apocalyptic number.

165670555 is a deficient number, since it is larger than the sum of its proper divisors (33134117).

165670555 is an equidigital number, since it uses as much as digits as its factorization.

165670555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33134116.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 165670555 is about 12871.3074316481. The cubic root of 165670555 is about 549.2226539166. Note that the first 3 decimals are identical.

The spelling of 165670555 in words is "one hundred sixty-five million, six hundred seventy thousand, five hundred fifty-five".