65004428521 has 4 divisors (see below), whose sum is σ = 68828218452. Its totient is φ = 61180638592.

The previous prime is 65004428513. The next prime is 65004428527. The reversal of 65004428521 is 12582440056.

65004428521 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 can be written as a sum of positive squares in 2 ways, for example, as 53121030400 + 11883398121 = 230480^2 + 109011^2 .

It is a cyclic number.

It is not a de Polignac number, because 65004428521 - 2³ = 65004428513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65004428527) 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, 1911894940 + ... + 1911894973.

It is an arithmetic number, because the mean of its divisors is an integer number (17207054613).

Almost surely, 2^65004428521 is an apocalyptic number.

It is an amenable number.

65004428521 is a deficient number, since it is larger than the sum of its proper divisors (3823789931).

65004428521 is a wasteful number, since it uses less digits than its factorization.

65004428521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823789930.

The product of its (nonzero) digits is 76800, while the sum is 37.

Adding to 65004428521 its reverse (12582440056), we get a palindrome (77586868577).

The spelling of 65004428521 in words is "sixty-five billion, four million, four hundred twenty-eight thousand, five hundred twenty-one".