691368582871 has 4 divisors (see below), whose sum is σ = 700120084000. Its totient is φ = 682617081744.

The previous prime is 691368582851. The next prime is 691368582887. The reversal of 691368582871 is 178285863196.

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 691368582871 - 2³¹ = 689221099223 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 (691368582851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4375750446 + ... + 4375750603.

It is an arithmetic number, because the mean of its divisors is an integer number (175030021000).

Almost surely, 2^691368582871 is an apocalyptic number.

691368582871 is a deficient number, since it is larger than the sum of its proper divisors (8751501129).

691368582871 is an equidigital number, since it uses as much as digits as its factorization.

691368582871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8751501128.

The product of its digits is 34836480, while the sum is 64.

The spelling of 691368582871 in words is "six hundred ninety-one billion, three hundred sixty-eight million, five hundred eighty-two thousand, eight hundred seventy-one".