1854347844521 has 6 divisors (see below), whose sum is σ = 1938477047850. Its totient is φ = 1773724024688.

The previous prime is 1854347844457. The next prime is 1854347844529. The reversal of 1854347844521 is 1254487434581.

It can be written as a sum of positive squares in only one way, i.e., 1826311690921 + 28036153600 = 1351411^2 + 167440^2 .

It is not a de Polignac number, because 1854347844521 - 2⁶ = 1854347844457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1854347844529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1752691196 + ... + 1752692253.

It is an arithmetic number, because the mean of its divisors is an integer number (323079507975).

Almost surely, 2^{1854347844521} is an apocalyptic number.

It is an amenable number.

1854347844521 is a deficient number, since it is larger than the sum of its proper divisors (84129203329).

1854347844521 is an equidigital number, since it uses as much as digits as its factorization.

1854347844521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505383495 (or 3505383472 counting only the distinct ones).

The product of its digits is 17203200, while the sum is 56.

The spelling of 1854347844521 in words is "one trillion, eight hundred fifty-four billion, three hundred forty-seven million, eight hundred forty-four thousand, five hundred twenty-one".