8723161655520 has 384 divisors, whose sum is σ = 30336435892224. Its totient is φ = 2093544628224.

The previous prime is 8723161655443. The next prime is 8723161655531. The reversal of 8723161655520 is 255561613278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77076094 + ... + 77189186.

It is an arithmetic number, because the mean of its divisors is an integer number (79001135136).

Almost surely, 2^{8723161655520} is an apocalyptic number.

8723161655520 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 8723161655520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15168217946112).

8723161655520 is an abundant number, since it is smaller than the sum of its proper divisors (21613274236704).

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

8723161655520 is a wasteful number, since it uses less digits than its factorization.

8723161655520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113434 (or 113426 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 51.

The spelling of 8723161655520 in words is "eight trillion, seven hundred twenty-three billion, one hundred sixty-one million, six hundred fifty-five thousand, five hundred twenty".