165220611 has 8 divisors (see below), whose sum is σ = 225667344. Its totient is φ = 107460480.

The previous prime is 165220589. The next prime is 165220613. The reversal of 165220611 is 116022561.

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

It is not a de Polignac number, because 165220611 - 2¹⁴ = 165204227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165220613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671506 + ... + 671751.

It is an arithmetic number, because the mean of its divisors is an integer number (28208418).

Almost surely, 2^165220611 is an apocalyptic number.

165220611 is a deficient number, since it is larger than the sum of its proper divisors (60446733).

165220611 is a wasteful number, since it uses less digits than its factorization.

165220611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343301.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 165220611 is about 12853.8169817374. The cubic root of 165220611 is about 548.7249925732.

The spelling of 165220611 in words is "one hundred sixty-five million, two hundred twenty thousand, six hundred eleven".