186853855385 has 4 divisors (see below), whose sum is σ = 224224626468. Its totient is φ = 149483084304.

The previous prime is 186853855337. The next prime is 186853855393. The reversal of 186853855385 is 583558358681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583558358681 = 1459 ⋅399971459.

It can be written as a sum of positive squares in 2 ways, for example, as 68286574489 + 118567280896 = 261317^2 + 344336^2 .

It is a cyclic number.

It is not a de Polignac number, because 186853855385 - 2²² = 186849661081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18685385534 + ... + 18685385543.

It is an arithmetic number, because the mean of its divisors is an integer number (56056156617).

Almost surely, 2^186853855385 is an apocalyptic number.

It is an amenable number.

186853855385 is a deficient number, since it is larger than the sum of its proper divisors (37370771083).

186853855385 is an equidigital number, since it uses as much as digits as its factorization.

186853855385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37370771082.

The product of its digits is 138240000, while the sum is 65.

The spelling of 186853855385 in words is "one hundred eighty-six billion, eight hundred fifty-three million, eight hundred fifty-five thousand, three hundred eighty-five".