208198136161 has 8 divisors (see below), whose sum is σ = 219040361064. Its totient is φ = 197630398080.

The previous prime is 208198136143. The next prime is 208198136173. The reversal of 208198136161 is 161631891802.

It can be written as a sum of positive squares in 4 ways, for example, as 2063975761 + 206134160400 = 45431^2 + 454020^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208198136161 - 2⁵ = 208198136129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208198136101) 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, 68620150 + ... + 68623183.

It is an arithmetic number, because the mean of its divisors is an integer number (27380045133).

Almost surely, 2^208198136161 is an apocalyptic number.

It is an amenable number.

208198136161 is a deficient number, since it is larger than the sum of its proper divisors (10842224903).

208198136161 is a wasteful number, since it uses less digits than its factorization.

208198136161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137243411.

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 208198136161 in words is "two hundred eight billion, one hundred ninety-eight million, one hundred thirty-six thousand, one hundred sixty-one".