691844579459 has 8 divisors (see below), whose sum is σ = 756443247552. Its totient is φ = 627529862440.

The previous prime is 691844579441. The next prime is 691844579479. The reversal of 691844579459 is 954975448196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691844579459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691844579392 and 691844579401.

It is not an unprimeable number, because it can be changed into a prime (691844579479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70982669 + ... + 70992414.

It is an arithmetic number, because the mean of its divisors is an integer number (94555405944).

Almost surely, 2^691844579459 is an apocalyptic number.

691844579459 is a deficient number, since it is larger than the sum of its proper divisors (64598668093).

691844579459 is a wasteful number, since it uses less digits than its factorization.

691844579459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141975537.

The product of its digits is 391910400, while the sum is 71.

The spelling of 691844579459 in words is "six hundred ninety-one billion, eight hundred forty-four million, five hundred seventy-nine thousand, four hundred fifty-nine".