9691691678 has 16 divisors (see below), whose sum is σ = 14605856496. Its totient is φ = 4823115840.

The previous prime is 9691691657. The next prime is 9691691683. The reversal of 9691691678 is 8761961969.

It is a self number, because there is not a number n which added to its sum of digits gives 9691691678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465050 + ... + 485442.

It is an arithmetic number, because the mean of its divisors is an integer number (912866031).

Almost surely, 2^9691691678 is an apocalyptic number.

9691691678 is a deficient number, since it is larger than the sum of its proper divisors (4914164818).

9691691678 is a wasteful number, since it uses less digits than its factorization.

9691691678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21499.

The product of its digits is 8817984, while the sum is 62.

The square root of 9691691678 is about 98446.3898677854. The cubic root of 9691691678 is about 2132.0621640052.

The spelling of 9691691678 in words is "nine billion, six hundred ninety-one million, six hundred ninety-one thousand, six hundred seventy-eight".