694666845 has 18 divisors (see below), whose sum is σ = 1204395738. Its totient is φ = 370394688.

The previous prime is 694666837. The next prime is 694666853. The reversal of 694666845 is 548666496.

It is an interprime number because it is at equal distance from previous prime (694666837) and next prime (694666853).

It can be written as a sum of positive squares in 3 ways, for example, as 4186116 + 690480729 = 2046^2 + 26277^2 .

It is not a de Polignac number, because 694666845 - 2³ = 694666837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 694666791 and 694666800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 174841 + ... + 178769.

Almost surely, 2^694666845 is an apocalyptic number.

It is an amenable number.

694666845 is a deficient number, since it is larger than the sum of its proper divisors (509728893).

694666845 is an frugal number, since it uses more digits than its factorization.

694666845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7869 (or 3937 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 694666845 is about 26356.5332507900. The cubic root of 694666845 is about 885.6433319047.

The spelling of 694666845 in words is "six hundred ninety-four million, six hundred sixty-six thousand, eight hundred forty-five".