1821143045569 has 8 divisors (see below), whose sum is σ = 1827918368640. Its totient is φ = 1814368129200.

The previous prime is 1821143045549. The next prime is 1821143045573. The reversal of 1821143045569 is 9655403411281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1821143045569 - 2⁷ = 1821143045441 is a prime.

It is a super-2 number, since 2×1821143045569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821143045549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11198562 + ... + 11360020.

It is an arithmetic number, because the mean of its divisors is an integer number (228489796080).

Almost surely, 2^{1821143045569} is an apocalyptic number.

It is an amenable number.

1821143045569 is a deficient number, since it is larger than the sum of its proper divisors (6775323071).

1821143045569 is a wasteful number, since it uses less digits than its factorization.

1821143045569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203351.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 1821143045569 in words is "one trillion, eight hundred twenty-one billion, one hundred forty-three million, forty-five thousand, five hundred sixty-nine".