685205545 has 8 divisors (see below), whose sum is σ = 827292096. Its totient is φ = 544800816.

The previous prime is 685205539. The next prime is 685205551. The reversal of 685205545 is 545502586.

It is an interprime number because it is at equal distance from previous prime (685205539) and next prime (685205551).

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 685205545 - 2⁹ = 685205033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685205498 and 685205507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419557 + ... + 421186.

It is an arithmetic number, because the mean of its divisors is an integer number (103411512).

Almost surely, 2^685205545 is an apocalyptic number.

It is an amenable number.

685205545 is a deficient number, since it is larger than the sum of its proper divisors (142086551).

685205545 is a wasteful number, since it uses less digits than its factorization.

685205545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840911.

The product of its (nonzero) digits is 240000, while the sum is 40.

The square root of 685205545 is about 26176.4310974586. The cubic root of 685205545 is about 881.6041440332.

The spelling of 685205545 in words is "six hundred eighty-five million, two hundred five thousand, five hundred forty-five".