243622418861 has 4 divisors (see below), whose sum is σ = 246359749500. Its totient is φ = 240885088224.

The previous prime is 243622418843. The next prime is 243622418881. The reversal of 243622418861 is 168814226342.

243622418861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168814226342 = 2 ⋅84407113171.

It can be written as a sum of positive squares in 2 ways, for example, as 25468968100 + 218153450761 = 159590^2 + 467069^2 .

It is a cyclic number.

It is not a de Polignac number, because 243622418861 - 2⁶ = 243622418797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243622418881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1368665186 + ... + 1368665363.

It is an arithmetic number, because the mean of its divisors is an integer number (61589937375).

Almost surely, 2^243622418861 is an apocalyptic number.

It is an amenable number.

243622418861 is a deficient number, since it is larger than the sum of its proper divisors (2737330639).

243622418861 is an equidigital number, since it uses as much as digits as its factorization.

243622418861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737330638.

The product of its digits is 884736, while the sum is 47.

The spelling of 243622418861 in words is "two hundred forty-three billion, six hundred twenty-two million, four hundred eighteen thousand, eight hundred sixty-one".