9991137087376 has 15 divisors (see below), whose sum is σ = 19357852603611. Its totient is φ = 4995562221936.

The previous prime is 9991137087313. The next prime is 9991137087403. The reversal of 9991137087376 is 6737807311999.

The square root of 9991137087376 is 3160876.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12248395 + ... + 13038613.

Almost surely, 2^{9991137087376} is an apocalyptic number.

9991137087376 is the 3160876-th square number.

It is an amenable number.

9991137087376 is a deficient number, since it is larger than the sum of its proper divisors (9366715516235).

9991137087376 is an frugal number, since it uses more digits than its factorization.

9991137087376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580446 (or 790221 counting only the distinct ones).

The product of its (nonzero) digits is 108020304, while the sum is 70.

The spelling of 9991137087376 in words is "nine trillion, nine hundred ninety-one billion, one hundred thirty-seven million, eighty-seven thousand, three hundred seventy-six".