561100505100 has 72 divisors (see below), whose sum is σ = 1631145058368. Its totient is φ = 148917652800.

The previous prime is 561100505087. The next prime is 561100505131. The reversal of 561100505100 is 1505001165.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4368774 + ... + 4495373.

Almost surely, 2^561100505100 is an apocalyptic number.

561100505100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561100505100 is an abundant number, since it is smaller than the sum of its proper divisors (1070044553268).

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

561100505100 is a wasteful number, since it uses less digits than its factorization.

561100505100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8864375 (or 8864368 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 561100505100 its reverse (1505001165), we get a palindrome (562605506265).

The spelling of 561100505100 in words is "five hundred sixty-one billion, one hundred million, five hundred five thousand, one hundred".