8655617038720 has 128 divisors (see below), whose sum is σ = 20754082310400. Its totient is φ = 3451921643520.

The previous prime is 8655617038699. The next prime is 8655617038721. The reversal of 8655617038720 is 278307165568.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-3 number, since 3×8655617038720³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8655617038721) 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, 1137845157 + ... + 1137852763.

It is an arithmetic number, because the mean of its divisors is an integer number (162141268050).

Almost surely, 2^{8655617038720} is an apocalyptic number.

8655617038720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8655617038720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10377041155200).

8655617038720 is an abundant number, since it is smaller than the sum of its proper divisors (12098465271680).

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

8655617038720 is a wasteful number, since it uses less digits than its factorization.

8655617038720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12696 (or 12684 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 8655617038720 in words is "eight trillion, six hundred fifty-five billion, six hundred seventeen million, thirty-eight thousand, seven hundred twenty".