685505875055 has 16 divisors (see below), whose sum is σ = 836589630240. Its totient is φ = 539083871232.

The previous prime is 685505875031. The next prime is 685505875127. The reversal of 685505875055 is 550578505586.

It is a cyclic number.

It is not a de Polignac number, because 685505875055 - 2¹⁴ = 685505858671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a junction number, because it is equal to n+sod(n) for n = 685505874985 and 685505875003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8164247 + ... + 8247783.

It is an arithmetic number, because the mean of its divisors is an integer number (52286851890).

Almost surely, 2^685505875055 is an apocalyptic number.

685505875055 is a deficient number, since it is larger than the sum of its proper divisors (151083755185).

685505875055 is a wasteful number, since it uses less digits than its factorization.

685505875055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111418.

The product of its (nonzero) digits is 42000000, while the sum is 59.

The spelling of 685505875055 in words is "six hundred eighty-five billion, five hundred five million, eight hundred seventy-five thousand, fifty-five".