685883728441 has 8 divisors (see below), whose sum is σ = 728814282984. Its totient is φ = 643240335360.

The previous prime is 685883728337. The next prime is 685883728447. The reversal of 685883728441 is 144827388586.

It can be written as a sum of positive squares in 4 ways, for example, as 438536652841 + 247347075600 = 662221^2 + 497340^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 685883728441 - 2³⁹ = 136127914553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685883728447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71785440 + ... + 71794993.

It is an arithmetic number, because the mean of its divisors is an integer number (91101785373).

Almost surely, 2^685883728441 is an apocalyptic number.

It is an amenable number.

685883728441 is a deficient number, since it is larger than the sum of its proper divisors (42930554543).

685883728441 is a wasteful number, since it uses less digits than its factorization.

685883728441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143580731.

The product of its digits is 82575360, while the sum is 64.

The spelling of 685883728441 in words is "six hundred eighty-five billion, eight hundred eighty-three million, seven hundred twenty-eight thousand, four hundred forty-one".