685045497473 has 4 divisors (see below), whose sum is σ = 725342291460. Its totient is φ = 644748703488.

The previous prime is 685045497413. The next prime is 685045497497. The reversal of 685045497473 is 374794540586.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 633119393344 + 51926104129 = 795688^2 + 227873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685045497473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685045497413) 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, 20148396968 + ... + 20148397001.

It is an arithmetic number, because the mean of its divisors is an integer number (181335572865).

Almost surely, 2^685045497473 is an apocalyptic number.

It is an amenable number.

685045497473 is a deficient number, since it is larger than the sum of its proper divisors (40296793987).

685045497473 is a wasteful number, since it uses less digits than its factorization.

685045497473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40296793986.

The product of its (nonzero) digits is 101606400, while the sum is 62.

The spelling of 685045497473 in words is "six hundred eighty-five billion, forty-five million, four hundred ninety-seven thousand, four hundred seventy-three".