144556661 has 8 divisors (see below), whose sum is σ = 153166104. Its totient is φ = 135959040.

The previous prime is 144556613. The next prime is 144556663. The reversal of 144556661 is 166655441.

It is a happy number.

144556661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 33570436 + 110986225 = 5794^2 + 10535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144556661 - 2⁶ = 144556597 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 (144556663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41171 + ... + 44543.

It is an arithmetic number, because the mean of its divisors is an integer number (19145763).

Almost surely, 2^144556661 is an apocalyptic number.

It is an amenable number.

144556661 is a deficient number, since it is larger than the sum of its proper divisors (8609443).

144556661 is a wasteful number, since it uses less digits than its factorization.

144556661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911.

The product of its digits is 86400, while the sum is 38.

The square root of 144556661 is about 12023.1718360839. The cubic root of 144556661 is about 524.8228106507.

The spelling of 144556661 in words is "one hundred forty-four million, five hundred fifty-six thousand, six hundred sixty-one".