617561805822 has 64 divisors (see below), whose sum is σ = 1400715966720. Its totient is φ = 179943980544.

The previous prime is 617561805821. The next prime is 617561805881. The reversal of 617561805822 is 228508165716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617561805821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3571638 + ... + 3740550.

It is an arithmetic number, because the mean of its divisors is an integer number (21886186980).

Almost surely, 2^617561805822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 617561805822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (700357983360).

617561805822 is an abundant number, since it is smaller than the sum of its proper divisors (783154160898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

617561805822 is a wasteful number, since it uses less digits than its factorization.

617561805822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171417.

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 617561805822 in words is "six hundred seventeen billion, five hundred sixty-one million, eight hundred five thousand, eight hundred twenty-two".