685473176765 has 16 divisors (see below), whose sum is σ = 892308272688. Its totient is φ = 502500711936.

The previous prime is 685473176749. The next prime is 685473176797. The reversal of 685473176765 is 567671374586.

It can be written as a sum of positive squares in 8 ways, for example, as 182613492889 + 502859683876 = 427333^2 + 709126^2 .

It is a cyclic number.

It is not a de Polignac number, because 685473176765 - 2⁴ = 685473176749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38479202 + ... + 38497011.

It is an arithmetic number, because the mean of its divisors is an integer number (55769267043).

Almost surely, 2^685473176765 is an apocalyptic number.

685473176765 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

685473176765 is a deficient number, since it is larger than the sum of its proper divisors (206835095923).

685473176765 is a wasteful number, since it uses less digits than its factorization.

685473176765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76976368.

The product of its digits is 177811200, while the sum is 65.

The spelling of 685473176765 in words is "six hundred eighty-five billion, four hundred seventy-three million, one hundred seventy-six thousand, seven hundred sixty-five".