685108206939 has 16 divisors (see below), whose sum is σ = 1035521177600. Its totient is φ = 399415310496.

The previous prime is 685108206917. The next prime is 685108206949. The reversal of 685108206939 is 939602801586.

It is not a de Polignac number, because 685108206939 - 2¹² = 685108202843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (685108206949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462285499 + ... + 462286980.

It is an arithmetic number, because the mean of its divisors is an integer number (64720073600).

Almost surely, 2^685108206939 is an apocalyptic number.

685108206939 is a deficient number, since it is larger than the sum of its proper divisors (350412970661).

685108206939 is a wasteful number, since it uses less digits than its factorization.

685108206939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924572514.

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 685108206939 in words is "six hundred eighty-five billion, one hundred eight million, two hundred six thousand, nine hundred thirty-nine".