561646043000 has 128 divisors (see below), whose sum is σ = 1502376145920. Its totient is φ = 192516393600.

The previous prime is 561646042939. The next prime is 561646043029. The reversal of 561646043000 is 340646165.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38933789 + ... + 38948211.

It is an arithmetic number, because the mean of its divisors is an integer number (11737313640).

Almost surely, 2^561646043000 is an apocalyptic number.

561646043000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561646043000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751188072960).

561646043000 is an abundant number, since it is smaller than the sum of its proper divisors (940730102920).

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

561646043000 is a wasteful number, since it uses less digits than its factorization.

561646043000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20014 (or 20000 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 561646043000 its reverse (340646165), we get a palindrome (561986689165).

The spelling of 561646043000 in words is "five hundred sixty-one billion, six hundred forty-six million, forty-three thousand".