66143106133621 has 16 divisors (see below), whose sum is σ = 72456431779008. Its totient is φ = 59880099283200.

The previous prime is 66143106133619. The next prime is 66143106133631. The reversal of 66143106133621 is 12633160134166.

It is a cyclic number.

It is not a de Polignac number, because 66143106133621 - 2¹ = 66143106133619 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 (66143106133631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1680820 + ... + 11623741.

It is an arithmetic number, because the mean of its divisors is an integer number (4528526986188).

Almost surely, 2^{66143106133621} is an apocalyptic number.

It is an amenable number.

66143106133621 is a deficient number, since it is larger than the sum of its proper divisors (6313325645387).

66143106133621 is a wasteful number, since it uses less digits than its factorization.

66143106133621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13306452.

The product of its (nonzero) digits is 279936, while the sum is 43.

Adding to 66143106133621 its reverse (12633160134166), we get a palindrome (78776266267787).

The spelling of 66143106133621 in words is "sixty-six trillion, one hundred forty-three billion, one hundred six million, one hundred thirty-three thousand, six hundred twenty-one".