185665445849 has 16 divisors (see below), whose sum is σ = 210518911680. Its totient is φ = 162326306880.

The previous prime is 185665445761. The next prime is 185665445863. The reversal of 185665445849 is 948544566581.

It is a cyclic number.

It is not a de Polignac number, because 185665445849 - 2³⁶ = 116945969113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (185665445899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1029839 + ... + 1196619.

It is an arithmetic number, because the mean of its divisors is an integer number (13157431980).

Almost surely, 2^185665445849 is an apocalyptic number.

185665445849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

185665445849 is a deficient number, since it is larger than the sum of its proper divisors (24853465831).

185665445849 is a wasteful number, since it uses less digits than its factorization.

185665445849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171320.

The product of its digits is 165888000, while the sum is 65.

The spelling of 185665445849 in words is "one hundred eighty-five billion, six hundred sixty-five million, four hundred forty-five thousand, eight hundred forty-nine".