685413745 has 4 divisors (see below), whose sum is σ = 822496500. Its totient is φ = 548330992.

The previous prime is 685413727. The next prime is 685413761. The reversal of 685413745 is 547314586.

685413745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 540283536 + 145130209 = 23244^2 + 12047^2 .

It is a cyclic number.

It is not a de Polignac number, because 685413745 - 2²⁷ = 551196017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68541370 + ... + 68541379.

It is an arithmetic number, because the mean of its divisors is an integer number (205624125).

Almost surely, 2^685413745 is an apocalyptic number.

It is an amenable number.

685413745 is a deficient number, since it is larger than the sum of its proper divisors (137082755).

685413745 is a wasteful number, since it uses less digits than its factorization.

685413745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137082754.

The product of its digits is 403200, while the sum is 43.

The square root of 685413745 is about 26180.4076553441. The cubic root of 685413745 is about 881.6934269239.

The spelling of 685413745 in words is "six hundred eighty-five million, four hundred thirteen thousand, seven hundred forty-five".