8720538357855 has 32 divisors (see below), whose sum is σ = 14693771600640. Its totient is φ = 4404202018560.

The previous prime is 8720538357829. The next prime is 8720538357919. The reversal of 8720538357855 is 5587538350278.

It is not a de Polignac number, because 8720538357855 - 2¹² = 8720538353759 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6181606 + ... + 7460115.

It is an arithmetic number, because the mean of its divisors is an integer number (459180362520).

Almost surely, 2^{8720538357855} is an apocalyptic number.

8720538357855 is a deficient number, since it is larger than the sum of its proper divisors (5973233242785).

8720538357855 is a wasteful number, since it uses less digits than its factorization.

8720538357855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13643991.

The product of its (nonzero) digits is 282240000, while the sum is 66.

The spelling of 8720538357855 in words is "eight trillion, seven hundred twenty billion, five hundred thirty-eight million, three hundred fifty-seven thousand, eight hundred fifty-five".