561100610500 has 96 divisors (see below), whose sum is σ = 1244221026048. Its totient is φ = 221008928000.

The previous prime is 561100610423. The next prime is 561100610519. The reversal of 561100610500 is 5016001165.

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 30414279 + ... + 30432721.

It is an arithmetic number, because the mean of its divisors is an integer number (12960635688).

Almost surely, 2^561100610500 is an apocalyptic number.

561100610500 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 561100610500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (622110513024).

561100610500 is an abundant number, since it is smaller than the sum of its proper divisors (683120415548).

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

561100610500 is a wasteful number, since it uses less digits than its factorization.

561100610500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19390 (or 19378 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 561100610500 its reverse (5016001165), we get a palindrome (566116611665).

The spelling of 561100610500 in words is "five hundred sixty-one billion, one hundred million, six hundred ten thousand, five hundred".