681835745 has 8 divisors (see below), whose sum is σ = 866332584. Its totient is φ = 513382144.

The previous prime is 681835709. The next prime is 681835747. The reversal of 681835745 is 547538186.

It can be written as a sum of positive squares in 4 ways, for example, as 144384256 + 537451489 = 12016^2 + 23183^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681835745 - 2²⁰ = 680787169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681835745.

It is not an unprimeable number, because it can be changed into a prime (681835747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4010714 + ... + 4010883.

It is an arithmetic number, because the mean of its divisors is an integer number (108291573).

Almost surely, 2^681835745 is an apocalyptic number.

It is an amenable number.

681835745 is a deficient number, since it is larger than the sum of its proper divisors (184496839).

681835745 is a wasteful number, since it uses less digits than its factorization.

681835745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8021619.

The product of its digits is 806400, while the sum is 47.

The square root of 681835745 is about 26111.9847005164. The cubic root of 681835745 is about 880.1565428294.

The spelling of 681835745 in words is "six hundred eighty-one million, eight hundred thirty-five thousand, seven hundred forty-five".