17591340779 has 4 divisors (see below), whose sum is σ = 18517200840. Its totient is φ = 16665480720.

The previous prime is 17591340761. The next prime is 17591340787. The reversal of 17591340779 is 97704319571.

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

It is a cyclic number.

It is not a de Polignac number, because 17591340779 - 2²⁸ = 17322905323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17591340779.

It is not an unprimeable number, because it can be changed into a prime (17591340709) 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, 462930002 + ... + 462930039.

It is an arithmetic number, because the mean of its divisors is an integer number (4629300210).

Almost surely, 2^17591340779 is an apocalyptic number.

17591340779 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

17591340779 is a deficient number, since it is larger than the sum of its proper divisors (925860061).

17591340779 is an equidigital number, since it uses as much as digits as its factorization.

17591340779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925860060.

The product of its (nonzero) digits is 1666980, while the sum is 53.

The spelling of 17591340779 in words is "seventeen billion, five hundred ninety-one million, three hundred forty thousand, seven hundred seventy-nine".