789855661 has 8 divisors (see below), whose sum is σ = 919724544. Its totient is φ = 664244880.

The previous prime is 789855637. The next prime is 789855679. The reversal of 789855661 is 166558987.

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 789855661 - 2⁷ = 789855533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (789855961) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1064125 + ... + 1064866.

It is an arithmetic number, because the mean of its divisors is an integer number (114965568).

Almost surely, 2^789855661 is an apocalyptic number.

It is an amenable number.

789855661 is a deficient number, since it is larger than the sum of its proper divisors (129868883).

789855661 is a wasteful number, since it uses less digits than its factorization.

789855661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129051.

The product of its digits is 3628800, while the sum is 55.

The square root of 789855661 is about 28104.3708522358. The cubic root of 789855661 is about 924.3772427651.

The spelling of 789855661 in words is "seven hundred eighty-nine million, eight hundred fifty-five thousand, six hundred sixty-one".