2181815280823 has 8 divisors (see below), whose sum is σ = 2195423989616. Its totient is φ = 2168209296000.

The previous prime is 2181815280811. The next prime is 2181815280871. The reversal of 2181815280823 is 3280825181812.

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 2181815280823 - 2⁹ = 2181815280311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181815200823) 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, 937903 + ... + 2289823.

It is an arithmetic number, because the mean of its divisors is an integer number (274427998702).

Almost surely, 2^{2181815280823} is an apocalyptic number.

2181815280823 is a deficient number, since it is larger than the sum of its proper divisors (13608708793).

2181815280823 is a wasteful number, since it uses less digits than its factorization.

2181815280823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361985.

The product of its (nonzero) digits is 491520, while the sum is 49.

The spelling of 2181815280823 in words is "two trillion, one hundred eighty-one billion, eight hundred fifteen million, two hundred eighty thousand, eight hundred twenty-three".