100506055561 has 4 divisors (see below), whose sum is σ = 101501165124. Its totient is φ = 99510946000.

The previous prime is 100506055519. The next prime is 100506055609. The reversal of 100506055561 is 165550605001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66451043961 + 34055011600 = 257781^2 + 184540^2 .

It is a cyclic number.

It is not a de Polignac number, because 100506055561 - 2¹¹ = 100506053513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100506055061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 497554630 + ... + 497554831.

It is an arithmetic number, because the mean of its divisors is an integer number (25375291281).

Almost surely, 2^100506055561 is an apocalyptic number.

It is an amenable number.

100506055561 is a deficient number, since it is larger than the sum of its proper divisors (995109563).

100506055561 is an equidigital number, since it uses as much as digits as its factorization.

100506055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995109562.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 100506055561 in words is "one hundred billion, five hundred six million, fifty-five thousand, five hundred sixty-one".