144215661 has 16 divisors (see below), whose sum is σ = 195862016. Its totient is φ = 94369536.

The previous prime is 144215639. The next prime is 144215791. The reversal of 144215661 is 166512441.

It is not a de Polignac number, because 144215661 - 2¹⁸ = 143953517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144213661) 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 15 ways as a sum of consecutive naturals, for example, 47361 + ... + 50313.

It is an arithmetic number, because the mean of its divisors is an integer number (12241376).

Almost surely, 2^144215661 is an apocalyptic number.

It is an amenable number.

144215661 is a deficient number, since it is larger than the sum of its proper divisors (51646355).

144215661 is a wasteful number, since it uses less digits than its factorization.

144215661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its digits is 5760, while the sum is 30.

The square root of 144215661 is about 12008.9825131024. The cubic root of 144215661 is about 524.4098111529.

The spelling of 144215661 in words is "one hundred forty-four million, two hundred fifteen thousand, six hundred sixty-one".