6891908697 has 6 divisors (see below), whose sum is σ = 9954979242. Its totient is φ = 4594605792.

The previous prime is 6891908687. The next prime is 6891908713. The reversal of 6891908697 is 7968091986.

It can be written as a sum of positive squares in only one way, i.e., 5943022281 + 948886416 = 77091^2 + 30804^2 .

It is not a de Polignac number, because 6891908697 - 2¹¹ = 6891906649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6891908677) 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 5 ways as a sum of consecutive naturals, for example, 382883808 + ... + 382883825.

It is an arithmetic number, because the mean of its divisors is an integer number (1659163207).

Almost surely, 2^6891908697 is an apocalyptic number.

It is an amenable number.

6891908697 is a deficient number, since it is larger than the sum of its proper divisors (3063070545).

6891908697 is a wasteful number, since it uses less digits than its factorization.

6891908697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765767639 (or 765767636 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The square root of 6891908697 is about 83017.5204218965. The cubic root of 6891908697 is about 1903.0338140461.

The spelling of 6891908697 in words is "six billion, eight hundred ninety-one million, nine hundred eight thousand, six hundred ninety-seven".