1685243032961 has 4 divisors (see below), whose sum is σ = 1686614265300. Its totient is φ = 1683871800624.

The previous prime is 1685243032951. The next prime is 1685243032981. The reversal of 1685243032961 is 1692303425861.

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 1521877518736 + 163365514225 = 1233644^2 + 404185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685243032961 - 2⁶ = 1685243032897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1685243032951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685614326 + ... + 685616783.

It is an arithmetic number, because the mean of its divisors is an integer number (421653566325).

Almost surely, 2^{1685243032961} is an apocalyptic number.

It is an amenable number.

1685243032961 is a deficient number, since it is larger than the sum of its proper divisors (1371232339).

1685243032961 is a wasteful number, since it uses less digits than its factorization.

1685243032961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371232338.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 1685243032961 in words is "one trillion, six hundred eighty-five billion, two hundred forty-three million, thirty-two thousand, nine hundred sixty-one".