199694584385 has 4 divisors (see below), whose sum is σ = 239633501268. Its totient is φ = 159755667504.

The previous prime is 199694584381. The next prime is 199694584399. The reversal of 199694584385 is 583485496991.

It is a Cunningham number, because it is equal to 446872²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 71890479376 + 127804105009 = 268124^2 + 357497^2 .

It is a cyclic number.

It is not a de Polignac number, because 199694584385 - 2² = 199694584381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199694584381) 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, 19969458434 + ... + 19969458443.

It is an arithmetic number, because the mean of its divisors is an integer number (59908375317).

Almost surely, 2^199694584385 is an apocalyptic number.

It is an amenable number.

199694584385 is a deficient number, since it is larger than the sum of its proper divisors (39938916883).

199694584385 is an equidigital number, since it uses as much as digits as its factorization.

199694584385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39938916882.

The product of its digits is 335923200, while the sum is 71.

The spelling of 199694584385 in words is "one hundred ninety-nine billion, six hundred ninety-four million, five hundred eighty-four thousand, three hundred eighty-five".