856614661 has 8 divisors (see below), whose sum is σ = 1010568704. Its totient is φ = 710555760.

The previous prime is 856614659. The next prime is 856614701. The reversal of 856614661 is 166416658.

856614661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 856614661 - 2¹ = 856614659 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 (856614061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1973550 + ... + 1973983.

It is an arithmetic number, because the mean of its divisors is an integer number (126321088).

Almost surely, 2^856614661 is an apocalyptic number.

It is an amenable number.

856614661 is a deficient number, since it is larger than the sum of its proper divisors (153954043).

856614661 is a wasteful number, since it uses less digits than its factorization.

856614661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947571.

The product of its digits is 207360, while the sum is 43.

The square root of 856614661 is about 29267.9801318779. The cubic root of 856614661 is about 949.7190899824.

The spelling of 856614661 in words is "eight hundred fifty-six million, six hundred fourteen thousand, six hundred sixty-one".