1851738188873 has 4 divisors (see below), whose sum is σ = 1894801867728. Its totient is φ = 1808674510020.

The previous prime is 1851738188827. The next prime is 1851738188917. The reversal of 1851738188873 is 3788818371581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1851738188873 - 2²² = 1851733994569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1851738188803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21531839363 + ... + 21531839448.

It is an arithmetic number, because the mean of its divisors is an integer number (473700466932).

Almost surely, 2^{1851738188873} is an apocalyptic number.

It is an amenable number.

1851738188873 is a deficient number, since it is larger than the sum of its proper divisors (43063678855).

1851738188873 is an equidigital number, since it uses as much as digits as its factorization.

1851738188873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43063678854.

The product of its digits is 72253440, while the sum is 68.

The spelling of 1851738188873 in words is "one trillion, eight hundred fifty-one billion, seven hundred thirty-eight million, one hundred eighty-eight thousand, eight hundred seventy-three".