9666901918557 has 128 divisors (see below), whose sum is σ = 16387554355200. Its totient is φ = 5582763648000.

The previous prime is 9666901918537. The next prime is 9666901918603. The reversal of 9666901918557 is 7558191096669.

It is not a de Polignac number, because 9666901918557 - 2¹⁴ = 9666901902173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666901918537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2510229682 + ... + 2510233532.

It is an arithmetic number, because the mean of its divisors is an integer number (128027768400).

Almost surely, 2^{9666901918557} is an apocalyptic number.

It is an amenable number.

9666901918557 is a deficient number, since it is larger than the sum of its proper divisors (6720652436643).

9666901918557 is a wasteful number, since it uses less digits than its factorization.

9666901918557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7336 (or 7330 counting only the distinct ones).

The product of its (nonzero) digits is 220449600, while the sum is 72.

The spelling of 9666901918557 in words is "nine trillion, six hundred sixty-six billion, nine hundred one million, nine hundred eighteen thousand, five hundred fifty-seven".