208638105198 has 16 divisors (see below), whose sum is σ = 430736733696. Its totient is φ = 67302614520.

The previous prime is 208638105173. The next prime is 208638105199. The reversal of 208638105198 is 891501836802.

It is a super-2 number, since 2×208638105198² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 208638105198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208638105199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560854936 + ... + 560855307.

It is an arithmetic number, because the mean of its divisors is an integer number (26921045856).

Almost surely, 2^208638105198 is an apocalyptic number.

208638105198 is an abundant number, since it is smaller than the sum of its proper divisors (222098628498).

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

208638105198 is a wasteful number, since it uses less digits than its factorization.

208638105198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121710279.

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 208638105198 in words is "two hundred eight billion, six hundred thirty-eight million, one hundred five thousand, one hundred ninety-eight".