1809468965573 has 4 divisors (see below), whose sum is σ = 1810864085580. Its totient is φ = 1808073845568.

The previous prime is 1809468965543. The next prime is 1809468965593. The reversal of 1809468965573 is 3755698649081.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1462592728129 + 346876237444 = 1209377^2 + 588962^2 .

It is a cyclic number.

It is not a de Polignac number, because 1809468965573 - 2²² = 1809464771269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1809468965497 and 1809468965506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809468965543) by changing a digit.

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, 697558058 + ... + 697560651.

It is an arithmetic number, because the mean of its divisors is an integer number (452716021395).

Almost surely, 2^{1809468965573} is an apocalyptic number.

It is an amenable number.

1809468965573 is a deficient number, since it is larger than the sum of its proper divisors (1395120007).

1809468965573 is a wasteful number, since it uses less digits than its factorization.

1809468965573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395120006.

The product of its (nonzero) digits is 391910400, while the sum is 71.

The spelling of 1809468965573 in words is "one trillion, eight hundred nine billion, four hundred sixty-eight million, nine hundred sixty-five thousand, five hundred seventy-three".