9666813553488 has 480 divisors, whose sum is σ = 34977836275200. Its totient is φ = 2422263951360.

The previous prime is 9666813553487. The next prime is 9666813553567. The reversal of 9666813553488 is 8843553186669.

It is a super-2 number, since 2×9666813553488² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666813553487) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 44799778 + ... + 45015038.

It is an arithmetic number, because the mean of its divisors is an integer number (72870492240).

Almost surely, 2^{9666813553488} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9666813553488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17488918137600).

9666813553488 is an abundant number, since it is smaller than the sum of its proper divisors (25311022721712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9666813553488 is a wasteful number, since it uses less digits than its factorization.

9666813553488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215467 (or 215458 counting only the distinct ones).

The product of its digits is 895795200, while the sum is 72.

The spelling of 9666813553488 in words is "nine trillion, six hundred sixty-six billion, eight hundred thirteen million, five hundred fifty-three thousand, four hundred eighty-eight".