1817822648361 has 4 divisors (see below), whose sum is σ = 2423763531152. Its totient is φ = 1211881765572.

The previous prime is 1817822648359. The next prime is 1817822648393. The reversal of 1817822648361 is 1638462287181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1817822648361 - 2¹ = 1817822648359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1817822648861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302970441391 + ... + 302970441396.

It is an arithmetic number, because the mean of its divisors is an integer number (605940882788).

Almost surely, 2^{1817822648361} is an apocalyptic number.

It is an amenable number.

1817822648361 is a deficient number, since it is larger than the sum of its proper divisors (605940882791).

1817822648361 is an equidigital number, since it uses as much as digits as its factorization.

1817822648361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605940882790.

The product of its digits is 6193152, while the sum is 57.

The spelling of 1817822648361 in words is "one trillion, eight hundred seventeen billion, eight hundred twenty-two million, six hundred forty-eight thousand, three hundred sixty-one".