208134583661 has 8 divisors (see below), whose sum is σ = 215618808600. Its totient is φ = 200670836800.

The previous prime is 208134583633. The next prime is 208134583669. The reversal of 208134583661 is 166385431802.

It can be written as a sum of positive squares in 4 ways, for example, as 70912494436 + 137222089225 = 266294^2 + 370435^2 .

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 208134583661 - 2⁶ = 208134583597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208134583669) 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, 5098826 + ... + 5139483.

It is an arithmetic number, because the mean of its divisors is an integer number (26952351075).

Almost surely, 2^208134583661 is an apocalyptic number.

It is an amenable number.

208134583661 is a deficient number, since it is larger than the sum of its proper divisors (7484224939).

208134583661 is a wasteful number, since it uses less digits than its factorization.

208134583661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10239039.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 208134583661 in words is "two hundred eight billion, one hundred thirty-four million, five hundred eighty-three thousand, six hundred sixty-one".