841666645 has 4 divisors (see below), whose sum is σ = 1009999980. Its totient is φ = 673333312.

The previous prime is 841666627. The next prime is 841666673. The reversal of 841666645 is 546666148.

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 509224356 + 332442289 = 22566^2 + 18233^2 .

It is a cyclic number.

It is not a de Polignac number, because 841666645 - 2⁵ = 841666613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 841666595 and 841666604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84166660 + ... + 84166669.

It is an arithmetic number, because the mean of its divisors is an integer number (252499995).

Almost surely, 2^841666645 is an apocalyptic number.

It is an amenable number.

841666645 is a deficient number, since it is larger than the sum of its proper divisors (168333335).

841666645 is a wasteful number, since it uses less digits than its factorization.

841666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168333334.

The product of its digits is 829440, while the sum is 46.

The square root of 841666645 is about 29011.4916024668. The cubic root of 841666645 is about 944.1624092906.

The spelling of 841666645 in words is "eight hundred forty-one million, six hundred sixty-six thousand, six hundred forty-five".