685723402004 has 6 divisors (see below), whose sum is σ = 1200015953514. Its totient is φ = 342861701000.

The previous prime is 685723401989. The next prime is 685723402027. The reversal of 685723402004 is 400204327586.

It can be written as a sum of positive squares in only one way, i.e., 444542227600 + 241181174404 = 666740^2 + 491102^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85715425247 + ... + 85715425254.

It is an arithmetic number, because the mean of its divisors is an integer number (200002658919).

Almost surely, 2^685723402004 is an apocalyptic number.

It is an amenable number.

685723402004 is a deficient number, since it is larger than the sum of its proper divisors (514292551510).

685723402004 is a wasteful number, since it uses less digits than its factorization.

685723402004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171430850505 (or 171430850503 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 41.

The spelling of 685723402004 in words is "six hundred eighty-five billion, seven hundred twenty-three million, four hundred two thousand, four".