65996821 has 8 divisors (see below), whose sum is σ = 75127104. Its totient is φ = 57388320.

The previous prime is 65996813. The next prime is 65996831. The reversal of 65996821 is 12869956.

65996821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 65996821 - 2³ = 65996813 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 (65996831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130176 + ... + 130681.

It is an arithmetic number, because the mean of its divisors is an integer number (9390888).

Almost surely, 2^65996821 is an apocalyptic number.

It is an amenable number.

65996821 is a deficient number, since it is larger than the sum of its proper divisors (9130283).

65996821 is a wasteful number, since it uses less digits than its factorization.

65996821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260891.

The product of its digits is 233280, while the sum is 46.

The square root of 65996821 is about 8123.8427483550. The cubic root of 65996821 is about 404.1175135227.

The spelling of 65996821 in words is "sixty-five million, nine hundred ninety-six thousand, eight hundred twenty-one".