660144023621 has 8 divisors (see below), whose sum is σ = 662800791744. Its totient is φ = 657487468000.

The previous prime is 660144023603. The next prime is 660144023629. The reversal of 660144023621 is 126320441066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660144023621 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 (660144023629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9912185 + ... + 9978561.

It is an arithmetic number, because the mean of its divisors is an integer number (82850098968).

Almost surely, 2^660144023621 is an apocalyptic number.

It is an amenable number.

660144023621 is a deficient number, since it is larger than the sum of its proper divisors (2656768123).

660144023621 is a wasteful number, since it uses less digits than its factorization.

660144023621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106251.

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 660144023621 its reverse (126320441066), we get a palindrome (786464464687).

The spelling of 660144023621 in words is "six hundred sixty billion, one hundred forty-four million, twenty-three thousand, six hundred twenty-one".