9999799764516 has 81 divisors (see below), whose sum is σ = 26678636260731. Its totient is φ = 3157717663728.

The previous prime is 9999799764433. The next prime is 9999799764517. The reversal of 9999799764516 is 6154679979999.

The square root of 9999799764516 is 3162246.

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

It is not an unprimeable number, because it can be changed into a prime (9999799764517) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 360482175 + ... + 360509913.

Almost surely, 2^{9999799764516} is an apocalyptic number.

9999799764516 is the 3162246-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999799764516

9999799764516 is an abundant number, since it is smaller than the sum of its proper divisors (16678836496215).

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

9999799764516 is an equidigital number, since it uses as much as digits as its factorization.

9999799764516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55526 (or 27763 counting only the distinct ones).

The product of its digits is 18749238480, while the sum is 90.

The spelling of 9999799764516 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred ninety-nine million, seven hundred sixty-four thousand, five hundred sixteen".