1821094878543 has 8 divisors (see below), whose sum is σ = 2429254300848. Its totient is φ = 1213499354304.

The previous prime is 1821094878523. The next prime is 1821094878557. The reversal of 1821094878543 is 3458784901281.

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

It is not a de Polignac number, because 1821094878543 - 2¹⁶ = 1821094813007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821094878523) 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, 140966980 + ... + 140979897.

It is an arithmetic number, because the mean of its divisors is an integer number (303656787606).

Almost surely, 2^{1821094878543} is an apocalyptic number.

1821094878543 is a deficient number, since it is larger than the sum of its proper divisors (608159422305).

1821094878543 is a wasteful number, since it uses less digits than its factorization.

1821094878543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281949033.

The product of its (nonzero) digits is 15482880, while the sum is 60.

The spelling of 1821094878543 in words is "one trillion, eight hundred twenty-one billion, ninety-four million, eight hundred seventy-eight thousand, five hundred forty-three".