846685618409 has 4 divisors (see below), whose sum is σ = 896490654804. Its totient is φ = 796880582016.

The previous prime is 846685618399. The next prime is 846685618451. The reversal of 846685618409 is 904816586648.

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 659663966809 + 187021651600 = 812197^2 + 432460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-846685618409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (846685618459) 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, 24902518172 + ... + 24902518205.

It is an arithmetic number, because the mean of its divisors is an integer number (224122663701).

Almost surely, 2^846685618409 is an apocalyptic number.

It is an amenable number.

846685618409 is a deficient number, since it is larger than the sum of its proper divisors (49805036395).

846685618409 is a wasteful number, since it uses less digits than its factorization.

846685618409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49805036394.

The product of its (nonzero) digits is 79626240, while the sum is 65.

The spelling of 846685618409 in words is "eight hundred forty-six billion, six hundred eighty-five million, six hundred eighteen thousand, four hundred nine".