9681709780971 has 12 divisors (see below), whose sum is σ = 14435811000000. Its totient is φ = 6246264374640.

The previous prime is 9681709780949. The next prime is 9681709780973. The reversal of 9681709780971 is 1790879071869.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-9681709780971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9681709780971.

It is not an unprimeable number, because it can be changed into a prime (9681709780973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17350734096 + ... + 17350734653.

It is an arithmetic number, because the mean of its divisors is an integer number (1202984250000).

Almost surely, 2^{9681709780971} is an apocalyptic number.

9681709780971 is a deficient number, since it is larger than the sum of its proper divisors (4754101219029).

9681709780971 is a wasteful number, since it uses less digits than its factorization.

9681709780971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34701468786 (or 34701468783 counting only the distinct ones).

The product of its (nonzero) digits is 96018048, while the sum is 72.

The spelling of 9681709780971 in words is "nine trillion, six hundred eighty-one billion, seven hundred nine million, seven hundred eighty thousand, nine hundred seventy-one".