9889917990976 has 21 divisors (see below), whose sum is σ = 19625355937551. Its totient is φ = 4944946416192.

The previous prime is 9889917990971. The next prime is 9889917990983. The reversal of 9889917990976 is 6790997199889.

The square root of 9889917990976 is 3144824.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9889917990971) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 24962041 + ... + 25355143.

It is an arithmetic number, because the mean of its divisors is an integer number (934540758931).

Almost surely, 2^{9889917990976} is an apocalyptic number.

9889917990976 is the 3144824-th square number.

It is an amenable number.

9889917990976 is a deficient number, since it is larger than the sum of its proper divisors (9735437946575).

9889917990976 is an frugal number, since it uses more digits than its factorization.

9889917990976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786218 (or 393105 counting only the distinct ones).

The product of its (nonzero) digits is 9999593856, while the sum is 91.

The spelling of 9889917990976 in words is "nine trillion, eight hundred eighty-nine billion, nine hundred seventeen million, nine hundred ninety thousand, nine hundred seventy-six".