65369821 has 16 divisors (see below), whose sum is σ = 72972288. Its totient is φ = 58060800.

The previous prime is 65369813. The next prime is 65369827. The reversal of 65369821 is 12896356.

It is a cyclic number.

It is not a de Polignac number, because 65369821 - 2³ = 65369813 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 (65369827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101661 + ... + 102301.

It is an arithmetic number, because the mean of its divisors is an integer number (4560768).

Almost surely, 2^65369821 is an apocalyptic number.

It is an amenable number.

65369821 is a deficient number, since it is larger than the sum of its proper divisors (7602467).

65369821 is a wasteful number, since it uses less digits than its factorization.

65369821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its digits is 77760, while the sum is 40.

The square root of 65369821 is about 8085.1605426238. The cubic root of 65369821 is about 402.8336721028.

The spelling of 65369821 in words is "sixty-five million, three hundred sixty-nine thousand, eight hundred twenty-one".