685561743 has 18 divisors (see below), whose sum is σ = 1045122624. Its totient is φ = 432984312.

The previous prime is 685561741. The next prime is 685561817. The reversal of 685561743 is 347165586.

685561743 is a `hidden beast` number, since 6 + 85 + 561 + 7 + 4 + 3 = 666.

It is not a de Polignac number, because 685561743 - 2¹ = 685561741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685561741) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 102255 + ... + 108752.

It is an arithmetic number, because the mean of its divisors is an integer number (58062368).

Almost surely, 2^685561743 is an apocalyptic number.

685561743 is a deficient number, since it is larger than the sum of its proper divisors (359560881).

685561743 is a wasteful number, since it uses less digits than its factorization.

685561743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211051 (or 211029 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 685561743 is about 26183.2340057526. The cubic root of 685561743 is about 881.7568822573.

The spelling of 685561743 in words is "six hundred eighty-five million, five hundred sixty-one thousand, seven hundred forty-three".