686918926503 has 6 divisors (see below), whose sum is σ = 992216227184. Its totient is φ = 457945950996.

The previous prime is 686918926493. The next prime is 686918926513. The reversal of 686918926503 is 305629819686.

686918926503 is a `hidden beast` number, since 68 + 69 + 1 + 8 + 9 + 2 + 6 + 503 = 666.

It is an interprime number because it is at equal distance from previous prime (686918926493) and next prime (686918926513).

It is not a de Polignac number, because 686918926503 - 2⁶ = 686918926439 is a prime.

It is a super-2 number, since 2×686918926503² (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 (686918926513) 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 5 ways as a sum of consecutive naturals, for example, 38162162575 + ... + 38162162592.

Almost surely, 2^686918926503 is an apocalyptic number.

686918926503 is a deficient number, since it is larger than the sum of its proper divisors (305297300681).

686918926503 is a wasteful number, since it uses less digits than its factorization.

686918926503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76324325173 (or 76324325170 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 686918926503 in words is "six hundred eighty-six billion, nine hundred eighteen million, nine hundred twenty-six thousand, five hundred three".