185390965218 has 16 divisors (see below), whose sum is σ = 390296769120. Its totient is φ = 58544515296.

The previous prime is 185390965213. The next prime is 185390965229. The reversal of 185390965218 is 812569093581.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (185390965213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 813118155 + ... + 813118382.

It is an arithmetic number, because the mean of its divisors is an integer number (24393548070).

Almost surely, 2^185390965218 is an apocalyptic number.

185390965218 is an abundant number, since it is smaller than the sum of its proper divisors (204905803902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

185390965218 is a wasteful number, since it uses less digits than its factorization.

185390965218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626236561.

The product of its (nonzero) digits is 4665600, while the sum is 57.

The spelling of 185390965218 in words is "one hundred eighty-five billion, three hundred ninety million, nine hundred sixty-five thousand, two hundred eighteen".