686843586557 has 4 divisors (see below), whose sum is σ = 701457279936. Its totient is φ = 672229893180.

The previous prime is 686843586529. The next prime is 686843586563. The reversal of 686843586557 is 755685348686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686843586557 - 2¹² = 686843582461 is a prime.

It is a super-2 number, since 2×686843586557² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686843580557) 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, 7306846619 + ... + 7306846712.

It is an arithmetic number, because the mean of its divisors is an integer number (175364319984).

Almost surely, 2^686843586557 is an apocalyptic number.

It is an amenable number.

686843586557 is a deficient number, since it is larger than the sum of its proper divisors (14613693379).

686843586557 is a wasteful number, since it uses less digits than its factorization.

686843586557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14613693378.

The product of its digits is 1161216000, while the sum is 71.

The spelling of 686843586557 in words is "six hundred eighty-six billion, eight hundred forty-three million, five hundred eighty-six thousand, five hundred fifty-seven".