6691992917 has 4 divisors (see below), whose sum is σ = 6707448300. Its totient is φ = 6676537536.

The previous prime is 6691992889. The next prime is 6691992929. The reversal of 6691992917 is 7192991966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1390842436 + 5301150481 = 37294^2 + 72809^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691992917 - 2¹⁰ = 6691991893 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 (6691992947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7727042 + ... + 7727907.

It is an arithmetic number, because the mean of its divisors is an integer number (1676862075).

Almost surely, 2^6691992917 is an apocalyptic number.

It is an amenable number.

6691992917 is a deficient number, since it is larger than the sum of its proper divisors (15455383).

6691992917 is a wasteful number, since it uses less digits than its factorization.

6691992917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15455382.

The product of its digits is 3306744, while the sum is 59.

The square root of 6691992917 is about 81804.6020526963. The cubic root of 6691992917 is about 1884.4523375278.

The spelling of 6691992917 in words is "six billion, six hundred ninety-one million, nine hundred ninety-two thousand, nine hundred seventeen".