65581449799 has 4 divisors (see below), whose sum is σ = 65582310240. Its totient is φ = 65580589360.

The previous prime is 65581449781. The next prime is 65581449811. The reversal of 65581449799 is 99794418556.

65581449799 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.

It is a cyclic number.

It is not a de Polignac number, because 65581449799 - 2¹¹ = 65581447751 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 (65581449719) 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, 303439 + ... + 472480.

It is an arithmetic number, because the mean of its divisors is an integer number (16395577560).

Almost surely, 2^65581449799 is an apocalyptic number.

65581449799 is a deficient number, since it is larger than the sum of its proper divisors (860441).

65581449799 is an equidigital number, since it uses as much as digits as its factorization.

65581449799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860440.

The product of its digits is 97977600, while the sum is 67.

The spelling of 65581449799 in words is "sixty-five billion, five hundred eighty-one million, four hundred forty-nine thousand, seven hundred ninety-nine".