73544442809 has 4 divisors (see below), whose sum is σ = 73545055716. Its totient is φ = 73543829904.

The previous prime is 73544442773. The next prime is 73544442877. The reversal of 73544442809 is 90824444537.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 65905158400 + 7639284409 = 256720^2 + 87403^2 .

It is a cyclic number.

It is not a de Polignac number, because 73544442809 - 2⁸ = 73544442553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73544441809) 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, 60854 + ... + 388319.

It is an arithmetic number, because the mean of its divisors is an integer number (18386263929).

Almost surely, 2^73544442809 is an apocalyptic number.

It is an amenable number.

73544442809 is a deficient number, since it is larger than the sum of its proper divisors (612907).

73544442809 is a wasteful number, since it uses less digits than its factorization.

73544442809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612906.

The product of its (nonzero) digits is 3870720, while the sum is 50.

The spelling of 73544442809 in words is "seventy-three billion, five hundred forty-four million, four hundred forty-two thousand, eight hundred nine".