165221454 has 16 divisors (see below), whose sum is σ = 347834880. Its totient is φ = 52175160.

The previous prime is 165221449. The next prime is 165221479. The reversal of 165221454 is 454122561.

It is a congruent number.

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, 724542 + ... + 724769.

It is an arithmetic number, because the mean of its divisors is an integer number (21739680).

Almost surely, 2^165221454 is an apocalyptic number.

165221454 is an abundant number, since it is smaller than the sum of its proper divisors (182613426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165221454 is a wasteful number, since it uses less digits than its factorization.

165221454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449335.

The product of its digits is 9600, while the sum is 30.

The square root of 165221454 is about 12853.8497735114. The cubic root of 165221454 is about 548.7259258192.

The spelling of 165221454 in words is "one hundred sixty-five million, two hundred twenty-one thousand, four hundred fifty-four".