185968211138 has 4 divisors (see below), whose sum is σ = 278952316710. Its totient is φ = 92984105568.

The previous prime is 185968211113. The next prime is 185968211179. The reversal of 185968211138 is 831112869581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 166262509009 + 19705702129 = 407753^2 + 140377^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 185968211138.

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 as a sum of consecutive naturals, namely, 46492052783 + ... + 46492052786.

Almost surely, 2^185968211138 is an apocalyptic number.

185968211138 is a deficient number, since it is larger than the sum of its proper divisors (92984105572).

185968211138 is an equidigital number, since it uses as much as digits as its factorization.

185968211138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92984105571.

The product of its digits is 829440, while the sum is 53.

The spelling of 185968211138 in words is "one hundred eighty-five billion, nine hundred sixty-eight million, two hundred eleven thousand, one hundred thirty-eight".