660556443540421 has 8 divisors (see below), whose sum is σ = 676005560524800. Its totient is φ = 645278035031280.

The previous prime is 660556443540403. The next prime is 660556443540451. The reversal of 660556443540421 is 124045344655066.

660556443540421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 660556443540421 - 2²³ = 660556435151813 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 (660556443540451) 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, 42677110981 + ... + 42677126458.

It is an arithmetic number, because the mean of its divisors is an integer number (84500695065600).

Almost surely, 2^{660556443540421} is an apocalyptic number.

It is an amenable number.

660556443540421 is a deficient number, since it is larger than the sum of its proper divisors (15449116984379).

660556443540421 is a wasteful number, since it uses less digits than its factorization.

660556443540421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85354237619.

The product of its (nonzero) digits is 41472000, while the sum is 55.

The spelling of 660556443540421 in words is "six hundred sixty trillion, five hundred fifty-six billion, four hundred forty-three million, five hundred forty thousand, four hundred twenty-one".