188102105561 has 4 divisors (see below), whose sum is σ = 198002216400. Its totient is φ = 178201994724.

The previous prime is 188102105557. The next prime is 188102105603. The reversal of 188102105561 is 165501201881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 188102105561 - 2² = 188102105557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188102105501) 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, 4950055391 + ... + 4950055428.

It is an arithmetic number, because the mean of its divisors is an integer number (49500554100).

Almost surely, 2^188102105561 is an apocalyptic number.

It is an amenable number.

188102105561 is a deficient number, since it is larger than the sum of its proper divisors (9900110839).

188102105561 is an equidigital number, since it uses as much as digits as its factorization.

188102105561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9900110838.

The product of its (nonzero) digits is 19200, while the sum is 38.

The spelling of 188102105561 in words is "one hundred eighty-eight billion, one hundred two million, one hundred five thousand, five hundred sixty-one".