561726806620 has 144 divisors (see below), whose sum is σ = 1413471608640. Its totient is φ = 186854169600.

The previous prime is 561726806609. The next prime is 561726806621. The reversal of 561726806620 is 26608627165.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561726806621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7233961 + ... + 7311199.

It is an arithmetic number, because the mean of its divisors is an integer number (9815775060).

Almost surely, 2^561726806620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561726806620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (706735804320).

561726806620 is an abundant number, since it is smaller than the sum of its proper divisors (851744802020).

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

561726806620 is a wasteful number, since it uses less digits than its factorization.

561726806620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77484 (or 77475 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 561726806620 in words is "five hundred sixty-one billion, seven hundred twenty-six million, eight hundred six thousand, six hundred twenty".