617966861 has 4 divisors (see below), whose sum is σ = 618064800. Its totient is φ = 617868924.

The previous prime is 617966819. The next prime is 617966873. The reversal of 617966861 is 168669716.

617966861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 617966861 - 2¹⁴ = 617950477 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 (617966161) 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, 38801 + ... + 52358.

It is an arithmetic number, because the mean of its divisors is an integer number (154516200).

Almost surely, 2^617966861 is an apocalyptic number.

It is an amenable number.

617966861 is a deficient number, since it is larger than the sum of its proper divisors (97939).

617966861 is an equidigital number, since it uses as much as digits as its factorization.

617966861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97938.

The product of its digits is 653184, while the sum is 50.

The square root of 617966861 is about 24858.9392573376. The cubic root of 617966861 is about 851.7688015620.

The spelling of 617966861 in words is "six hundred seventeen million, nine hundred sixty-six thousand, eight hundred sixty-one".