1851168461845 has 4 divisors (see below), whose sum is σ = 2221402154220. Its totient is φ = 1480934769472.

The previous prime is 1851168461833. The next prime is 1851168461851. The reversal of 1851168461845 is 5481648611581.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1196470631889 + 654697829956 = 1093833^2 + 809134^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851168461845 - 2⁹ = 1851168461333 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1851168461845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185116846180 + ... + 185116846189.

It is an arithmetic number, because the mean of its divisors is an integer number (555350538555).

Almost surely, 2^{1851168461845} is an apocalyptic number.

It is an amenable number.

1851168461845 is a deficient number, since it is larger than the sum of its proper divisors (370233692375).

1851168461845 is an equidigital number, since it uses as much as digits as its factorization.

1851168461845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370233692374.

The product of its digits is 7372800, while the sum is 58.

The spelling of 1851168461845 in words is "one trillion, eight hundred fifty-one billion, one hundred sixty-eight million, four hundred sixty-one thousand, eight hundred forty-five".