165421522 has 16 divisors (see below), whose sum is σ = 284499072. Its totient is φ = 70665120.

The previous prime is 165421519. The next prime is 165421547. The reversal of 165421522 is 225124561.

It is an unprimeable number.

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, 14643 + ... + 23350.

It is an arithmetic number, because the mean of its divisors is an integer number (17781192).

Almost surely, 2^165421522 is an apocalyptic number.

165421522 is a deficient number, since it is larger than the sum of its proper divisors (119077550).

165421522 is a wasteful number, since it uses less digits than its factorization.

165421522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38313.

The product of its digits is 4800, while the sum is 28.

The square root of 165421522 is about 12861.6298345116. The cubic root of 165421522 is about 548.9473220392.

The spelling of 165421522 in words is "one hundred sixty-five million, four hundred twenty-one thousand, five hundred twenty-two".