1821609125395 has 4 divisors (see below), whose sum is σ = 2185930950480. Its totient is φ = 1457287300312.

The previous prime is 1821609125377. The next prime is 1821609125423. The reversal of 1821609125395 is 5935219061281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1821609125395 - 2⁹ = 1821609124883 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182160912535 + ... + 182160912544.

It is an arithmetic number, because the mean of its divisors is an integer number (546482737620).

Almost surely, 2^{1821609125395} is an apocalyptic number.

1821609125395 is a deficient number, since it is larger than the sum of its proper divisors (364321825085).

1821609125395 is an equidigital number, since it uses as much as digits as its factorization.

1821609125395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364321825084.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 1821609125395 in words is "one trillion, eight hundred twenty-one billion, six hundred nine million, one hundred twenty-five thousand, three hundred ninety-five".