65504421 has 6 divisors (see below), whose sum is σ = 94617510. Its totient is φ = 43669608.

The previous prime is 65504407. The next prime is 65504477. The reversal of 65504421 is 12440556.

65504421 is a `hidden beast` number, since 655 + 0 + 4 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 62631396 + 2873025 = 7914^2 + 1695^2 .

It is not a de Polignac number, because 65504421 - 2⁶ = 65504357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65504521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3639126 + ... + 3639143.

It is an arithmetic number, because the mean of its divisors is an integer number (15769585).

Almost surely, 2^65504421 is an apocalyptic number.

It is an amenable number.

65504421 is a deficient number, since it is larger than the sum of its proper divisors (29113089).

65504421 is a wasteful number, since it uses less digits than its factorization.

65504421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278275 (or 7278272 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 65504421 is about 8093.4801538028. The cubic root of 65504421 is about 403.1099679991.

Adding to 65504421 its reverse (12440556), we get a palindrome (77944977).

The spelling of 65504421 in words is "sixty-five million, five hundred four thousand, four hundred twenty-one".