144221665 has 32 divisors (see below), whose sum is σ = 202705920. Its totient is φ = 96465600.

The previous prime is 144221663. The next prime is 144221677. The reversal of 144221665 is 566122441.

It is a happy number.

It is not a de Polignac number, because 144221665 - 2¹ = 144221663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144221663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 435550 + ... + 435880.

It is an arithmetic number, because the mean of its divisors is an integer number (6334560).

Almost surely, 2^144221665 is an apocalyptic number.

It is an amenable number.

144221665 is a deficient number, since it is larger than the sum of its proper divisors (58484255).

144221665 is a wasteful number, since it uses less digits than its factorization.

144221665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613.

The product of its digits is 11520, while the sum is 31.

The square root of 144221665 is about 12009.2324900470. The cubic root of 144221665 is about 524.4170884781.

The spelling of 144221665 in words is "one hundred forty-four million, two hundred twenty-one thousand, six hundred sixty-five".