6991706354089 has 8 divisors (see below), whose sum is σ = 7316155758600. Its totient is φ = 6674387705856.

The previous prime is 6991706354033. The next prime is 6991706354117. The reversal of 6991706354089 is 9804536071996.

It can be written as a sum of positive squares in 4 ways, for example, as 2260572390400 + 4731133963689 = 1503520^2 + 2175117^2 .

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 6991706354089 - 2¹¹ = 6991706352041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6991706354389) 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, 1782687064 + ... + 1782690985.

It is an arithmetic number, because the mean of its divisors is an integer number (914519469825).

Almost surely, 2^{6991706354089} is an apocalyptic number.

It is an amenable number.

6991706354089 is a deficient number, since it is larger than the sum of its proper divisors (324449404511).

6991706354089 is a wasteful number, since it uses less digits than its factorization.

6991706354089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565378139.

The product of its (nonzero) digits is 88179840, while the sum is 67.

The spelling of 6991706354089 in words is "six trillion, nine hundred ninety-one billion, seven hundred six million, three hundred fifty-four thousand, eighty-nine".