165221602 has 16 divisors (see below), whose sum is σ = 305024832. Its totient is φ = 65362320.

The previous prime is 165221593. The next prime is 165221603. The reversal of 165221602 is 206122561.

It is not an unprimeable number, because it can be changed into a prime (165221603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453724 + ... + 454087.

It is an arithmetic number, because the mean of its divisors is an integer number (19064052).

Almost surely, 2^165221602 is an apocalyptic number.

165221602 is a deficient number, since it is larger than the sum of its proper divisors (139803230).

165221602 is a wasteful number, since it uses less digits than its factorization.

165221602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907833.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 165221602 is about 12853.8555305402. The cubic root of 165221602 is about 548.7260896627.

The spelling of 165221602 in words is "one hundred sixty-five million, two hundred twenty-one thousand, six hundred two".