683918057781 has 12 divisors (see below), whose sum is σ = 1129007587552. Its totient is φ = 390810318696.

The previous prime is 683918057777. The next prime is 683918057827. The reversal of 683918057781 is 187750819386.

It is not a de Polignac number, because 683918057781 - 2² = 683918057777 is a prime.

It is a super-2 number, since 2×683918057781² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 10855842187 = 683918057781 / (6 + 8 + 3 + 9 + 1 + 8 + 0 + 5 + 7 + 7 + 8 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683918017781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5427921031 + ... + 5427921156.

Almost surely, 2^683918057781 is an apocalyptic number.

It is an amenable number.

683918057781 is a deficient number, since it is larger than the sum of its proper divisors (445089529771).

683918057781 is a wasteful number, since it uses less digits than its factorization.

683918057781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10855842200 (or 10855842197 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 63.

The spelling of 683918057781 in words is "six hundred eighty-three billion, nine hundred eighteen million, fifty-seven thousand, seven hundred eighty-one".