208161661814 has 4 divisors (see below), whose sum is σ = 312242492724. Its totient is φ = 104080830906.

The previous prime is 208161661811. The next prime is 208161661819. The reversal of 208161661814 is 418166161802.

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

It is a super-2 number, since 2×208161661814² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208161661811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52040415452 + ... + 52040415455.

It is an arithmetic number, because the mean of its divisors is an integer number (78060623181).

Almost surely, 2^208161661814 is an apocalyptic number.

208161661814 is a deficient number, since it is larger than the sum of its proper divisors (104080830910).

208161661814 is a wasteful number, since it uses less digits than its factorization.

208161661814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104080830909.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 208161661814 in words is "two hundred eight billion, one hundred sixty-one million, six hundred sixty-one thousand, eight hundred fourteen".