165345557 has 8 divisors (see below), whose sum is σ = 178845240. Its totient is φ = 151957440.

The previous prime is 165345541. The next prime is 165345569. The reversal of 165345557 is 755543561.

It can be written as a sum of positive squares in 4 ways, for example, as 5424241 + 159921316 = 2329^2 + 12646^2 .

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 165345557 - 2⁴ = 165345541 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 (165345517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24794 + ... + 30747.

It is an arithmetic number, because the mean of its divisors is an integer number (22355655).

Almost surely, 2^165345557 is an apocalyptic number.

It is an amenable number.

165345557 is a deficient number, since it is larger than the sum of its proper divisors (13499683).

165345557 is a wasteful number, since it uses less digits than its factorization.

165345557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55783.

The product of its digits is 315000, while the sum is 41.

The square root of 165345557 is about 12858.6763315669. The cubic root of 165345557 is about 548.8632798345.

The spelling of 165345557 in words is "one hundred sixty-five million, three hundred forty-five thousand, five hundred fifty-seven".