165555151 has 4 divisors (see below), whose sum is σ = 174268600. Its totient is φ = 156841704.

The previous prime is 165555149. The next prime is 165555157. The reversal of 165555151 is 151555561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165555151 - 2¹ = 165555149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165555157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4356696 + ... + 4356733.

It is an arithmetic number, because the mean of its divisors is an integer number (43567150).

Almost surely, 2^165555151 is an apocalyptic number.

165555151 is a deficient number, since it is larger than the sum of its proper divisors (8713449).

165555151 is an equidigital number, since it uses as much as digits as its factorization.

165555151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713448.

The product of its digits is 18750, while the sum is 34.

The square root of 165555151 is about 12866.8236562098. The cubic root of 165555151 is about 549.0950971237.

The spelling of 165555151 in words is "one hundred sixty-five million, five hundred fifty-five thousand, one hundred fifty-one".