185617998449 has 4 divisors (see below), whose sum is σ = 199896306036. Its totient is φ = 171339690864.

The previous prime is 185617998431. The next prime is 185617998487. The reversal of 185617998449 is 944899716581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 944899716581 = 919 ⋅1028182499.

It can be written as a sum of positive squares in 2 ways, for example, as 14672961424 + 170945037025 = 121132^2 + 413455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185617998449 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 (185617995449) 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, 7139153774 + ... + 7139153799.

It is an arithmetic number, because the mean of its divisors is an integer number (49974076509).

Almost surely, 2^185617998449 is an apocalyptic number.

It is an amenable number.

185617998449 is a deficient number, since it is larger than the sum of its proper divisors (14278307587).

185617998449 is a wasteful number, since it uses less digits than its factorization.

185617998449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14278307586.

The product of its digits is 156764160, while the sum is 71.

The spelling of 185617998449 in words is "one hundred eighty-five billion, six hundred seventeen million, nine hundred ninety-eight thousand, four hundred forty-nine".