9666768991 has 8 divisors (see below), whose sum is σ = 10583640144. Its totient is φ = 8756243520.

The previous prime is 9666768971. The next prime is 9666769001. The reversal of 9666768991 is 1998676669.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9666768991 - 2¹³ = 9666760799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666768931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1583230 + ... + 1589323.

It is an arithmetic number, because the mean of its divisors is an integer number (1322955018).

Almost surely, 2^9666768991 is an apocalyptic number.

9666768991 is a deficient number, since it is larger than the sum of its proper divisors (916871153).

9666768991 is a wasteful number, since it uses less digits than its factorization.

9666768991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172841.

The product of its digits is 52907904, while the sum is 67.

The square root of 9666768991 is about 98319.7283916102. The cubic root of 9666768991 is about 2130.2330257815.

The spelling of 9666768991 in words is "nine billion, six hundred sixty-six million, seven hundred sixty-eight thousand, nine hundred ninety-one".