9817785209052 has 18 divisors (see below), whose sum is σ = 24817179278528. Its totient is φ = 3272595069672.

The previous prime is 9817785209041. The next prime is 9817785209059. The reversal of 9817785209052 is 2509025877189.

9817785209052 is a `hidden beast` number, since 9 + 8 + 17 + 7 + 8 + 520 + 90 + 5 + 2 = 666.

9817785209052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×9817785209052² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9817785209059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 136358127868 + ... + 136358127939.

Almost surely, 2^{9817785209052} is an apocalyptic number.

It is an amenable number.

9817785209052 is an abundant number, since it is smaller than the sum of its proper divisors (14999394069476).

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

9817785209052 is a wasteful number, since it uses less digits than its factorization.

9817785209052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272716255817 (or 272716255812 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 63.

The spelling of 9817785209052 in words is "nine trillion, eight hundred seventeen billion, seven hundred eighty-five million, two hundred nine thousand, fifty-two".