165557607 has 8 divisors (see below), whose sum is σ = 228355440. Its totient is φ = 106565760.

The previous prime is 165557591. The next prime is 165557677. The reversal of 165557607 is 706755561.

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

It is not a de Polignac number, because 165557607 - 2⁴ = 165557591 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165557677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 951394 + ... + 951567.

It is an arithmetic number, because the mean of its divisors is an integer number (28544430).

Almost surely, 2^165557607 is an apocalyptic number.

165557607 is a deficient number, since it is larger than the sum of its proper divisors (62797833).

165557607 is a wasteful number, since it uses less digits than its factorization.

165557607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902993.

The product of its (nonzero) digits is 220500, while the sum is 42.

The square root of 165557607 is about 12866.9190951059. The cubic root of 165557607 is about 549.0978123738.

The spelling of 165557607 in words is "one hundred sixty-five million, five hundred fifty-seven thousand, six hundred seven".