8720803385505 has 12 divisors (see below), whose sum is σ = 15116059201620. Its totient is φ = 4651095138912.

The previous prime is 8720803385479. The next prime is 8720803385519. The reversal of 8720803385505 is 5055833080278.

It is a happy number.

8720803385505 is a `hidden beast` number, since 8 + 7 + 2 + 0 + 80 + 3 + 3 + 8 + 550 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3192793611921 + 5528009773584 = 1786839^2 + 2351172^2 .

It is not a de Polignac number, because 8720803385505 - 2⁸ = 8720803385249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96897815350 + ... + 96897815439.

It is an arithmetic number, because the mean of its divisors is an integer number (1259671600135).

Almost surely, 2^{8720803385505} is an apocalyptic number.

It is an amenable number.

8720803385505 is a deficient number, since it is larger than the sum of its proper divisors (6395255816115).

8720803385505 is a wasteful number, since it uses less digits than its factorization.

8720803385505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193795630800 (or 193795630797 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 54.

The spelling of 8720803385505 in words is "eight trillion, seven hundred twenty billion, eight hundred three million, three hundred eighty-five thousand, five hundred five".