1821493541015 has 8 divisors (see below), whose sum is σ = 2207433757248. Its totient is φ = 1442767160800.

The previous prime is 1821493541009. The next prime is 1821493541039. The reversal of 1821493541015 is 5101453941281.

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

It is not a de Polignac number, because 1821493541015 - 2¹⁶ = 1821493475479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1803458447 + ... + 1803459456.

It is an arithmetic number, because the mean of its divisors is an integer number (275929219656).

Almost surely, 2^{1821493541015} is an apocalyptic number.

1821493541015 is a deficient number, since it is larger than the sum of its proper divisors (385940216233).

1821493541015 is a wasteful number, since it uses less digits than its factorization.

1821493541015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606918009.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 1821493541015 in words is "one trillion, eight hundred twenty-one billion, four hundred ninety-three million, five hundred forty-one thousand, fifteen".