208561100107 has 4 divisors (see below), whose sum is σ = 208602875800. Its totient is φ = 208519324416.

The previous prime is 208561100089. The next prime is 208561100179. The reversal of 208561100107 is 701001165802.

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

It is a cyclic number.

It is not a de Polignac number, because 208561100107 - 2⁷ = 208561099979 is a prime.

It is a super-2 number, since 2×208561100107² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208561100197) 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, 20880357 + ... + 20890342.

It is an arithmetic number, because the mean of its divisors is an integer number (52150718950).

Almost surely, 2^208561100107 is an apocalyptic number.

208561100107 is a deficient number, since it is larger than the sum of its proper divisors (41775693).

208561100107 is an equidigital number, since it uses as much as digits as its factorization.

208561100107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41775692.

The product of its (nonzero) digits is 3360, while the sum is 31.

Adding to 208561100107 its reverse (701001165802), we get a palindrome (909562265909).

The spelling of 208561100107 in words is "two hundred eight billion, five hundred sixty-one million, one hundred thousand, one hundred seven".