8662720562500 has 189 divisors, whose sum is σ = 19365534989073. Its totient is φ = 3390624000000.

The previous prime is 8662720562473. The next prime is 8662720562501. The reversal of 8662720562500 is 52650272668.

The square root of 8662720562500 is 2943250.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 31 ways, for example, as 2102401401156 + 6560319161344 = 1449966^2 + 2561312^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8662720562501) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 44884562404 + ... + 44884562596.

Almost surely, 2^{8662720562500} is an apocalyptic number.

8662720562500 is the 2943250-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8662720562500

8662720562500 is an abundant number, since it is smaller than the sum of its proper divisors (10702814426573).

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

8662720562500 is an frugal number, since it uses more digits than its factorization.

8662720562500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 49.

Multiplying 8662720562500 by its sum of digits (49), we get a square (424473307562500 = 20602750²).

The spelling of 8662720562500 in words is "eight trillion, six hundred sixty-two billion, seven hundred twenty million, five hundred sixty-two thousand, five hundred".