100600505561 has 6 divisors (see below), whose sum is σ = 102124420650. Its totient is φ = 99099001056.

The previous prime is 100600505503. The next prime is 100600505567. The reversal of 100600505561 is 165505006001.

It can be written as a sum of positive squares in only one way, i.e., 52658775625 + 47941729936 = 229475^2 + 218956^2 .

It is not a de Polignac number, because 100600505561 - 2²⁶ = 100533396697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100600505567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11200736 + ... + 11209713.

It is an arithmetic number, because the mean of its divisors is an integer number (17020736775).

Almost surely, 2^100600505561 is an apocalyptic number.

It is an amenable number.

100600505561 is a deficient number, since it is larger than the sum of its proper divisors (1523915089).

100600505561 is an frugal number, since it uses more digits than its factorization.

100600505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22410583 (or 22410516 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 100600505561 in words is "one hundred billion, six hundred million, five hundred five thousand, five hundred sixty-one".