9866772991 has 16 divisors (see below), whose sum is σ = 10200960000. Its totient is φ = 9537863328.

The previous prime is 9866772983. The next prime is 9866773003. The reversal of 9866772991 is 1992776689.

9866772991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9866772991 - 2³ = 9866772983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9866772911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1713385 + ... + 1719133.

It is an arithmetic number, because the mean of its divisors is an integer number (637560000).

Almost surely, 2^9866772991 is an apocalyptic number.

9866772991 is a deficient number, since it is larger than the sum of its proper divisors (334187009).

9866772991 is a wasteful number, since it uses less digits than its factorization.

9866772991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6198.

The product of its digits is 20575296, while the sum is 64.

The square root of 9866772991 is about 99331.6313718848. The cubic root of 9866772991 is about 2144.8242541789.

The spelling of 9866772991 in words is "nine billion, eight hundred sixty-six million, seven hundred seventy-two thousand, nine hundred ninety-one".