186815820385 has 16 divisors (see below), whose sum is σ = 238490963712. Its totient is φ = 139994668800.

The previous prime is 186815820361. The next prime is 186815820391. The reversal of 186815820385 is 583028518681.

It is not a de Polignac number, because 186815820385 - 2⁵ = 186815820353 is a prime.

It is a super-2 number, since 2×186815820385² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5190201 + ... + 5226070.

It is an arithmetic number, because the mean of its divisors is an integer number (14905685232).

Almost surely, 2^186815820385 is an apocalyptic number.

It is an amenable number.

186815820385 is a deficient number, since it is larger than the sum of its proper divisors (51675143327).

186815820385 is a wasteful number, since it uses less digits than its factorization.

186815820385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10416504.

The product of its (nonzero) digits is 3686400, while the sum is 55.

The spelling of 186815820385 in words is "one hundred eighty-six billion, eight hundred fifteen million, eight hundred twenty thousand, three hundred eighty-five".