685811243041 has 4 divisors (see below), whose sum is σ = 686047488192. Its totient is φ = 685574997892.

The previous prime is 685811243017. The next prime is 685811243107. The reversal of 685811243041 is 140342118586.

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 a de Polignac number, because none of the positive numbers 2^k-685811243041 is a prime.

It is a super-3 number, since 3×685811243041³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685811243141) 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, 118118221 + ... + 118124026.

It is an arithmetic number, because the mean of its divisors is an integer number (171511872048).

Almost surely, 2^685811243041 is an apocalyptic number.

It is an amenable number.

685811243041 is a deficient number, since it is larger than the sum of its proper divisors (236245151).

685811243041 is a wasteful number, since it uses less digits than its factorization.

685811243041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236245150.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 685811243041 in words is "six hundred eighty-five billion, eight hundred eleven million, two hundred forty-three thousand, forty-one".