185213455869 has 32 divisors (see below), whose sum is σ = 271726640640. Its totient is φ = 111502904832.

The previous prime is 185213455789. The next prime is 185213455877. The reversal of 185213455869 is 968554312581.

It is not a de Polignac number, because 185213455869 - 2⁸ = 185213455613 is a prime.

It is a super-2 number, since 2×185213455869² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185213455969) 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 31 ways as a sum of consecutive naturals, for example, 4335787 + ... + 4378295.

It is an arithmetic number, because the mean of its divisors is an integer number (8491457520).

Almost surely, 2^185213455869 is an apocalyptic number.

It is an amenable number.

185213455869 is a deficient number, since it is larger than the sum of its proper divisors (86513184771).

185213455869 is a wasteful number, since it uses less digits than its factorization.

185213455869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44949.

The product of its digits is 10368000, while the sum is 57.

The spelling of 185213455869 in words is "one hundred eighty-five billion, two hundred thirteen million, four hundred fifty-five thousand, eight hundred sixty-nine".