65825021 has 8 divisors (see below), whose sum is σ = 67156800. Its totient is φ = 64503648.

The previous prime is 65825017. The next prime is 65825047. The reversal of 65825021 is 12052856.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65825021 - 2² = 65825017 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 (65824021) 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 7 ways as a sum of consecutive naturals, for example, 10865 + ... + 15801.

It is an arithmetic number, because the mean of its divisors is an integer number (8394600).

Almost surely, 2^65825021 is an apocalyptic number.

It is an amenable number.

65825021 is a deficient number, since it is larger than the sum of its proper divisors (1331779).

65825021 is a wasteful number, since it uses less digits than its factorization.

65825021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5203.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 65825021 is about 8113.2620443321. The cubic root of 65825021 is about 403.7665485394.

Adding to 65825021 its reverse (12052856), we get a palindrome (77877877).

The spelling of 65825021 in words is "sixty-five million, eight hundred twenty-five thousand, twenty-one".