561436543100 has 72 divisors (see below), whose sum is σ = 1234925126400. Its totient is φ = 221521740480.

The previous prime is 561436543093. The next prime is 561436543111. The reversal of 561436543100 is 1345634165.

It is a super-2 number, since 2×561436543100² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5284301 + ... + 5389499.

Almost surely, 2^561436543100 is an apocalyptic number.

561436543100 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 561436543100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (617462563200).

561436543100 is an abundant number, since it is smaller than the sum of its proper divisors (673488583300).

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

561436543100 is a wasteful number, since it uses less digits than its factorization.

561436543100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105939 (or 105932 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 561436543100 in words is "five hundred sixty-one billion, four hundred thirty-six million, five hundred forty-three thousand, one hundred".