65818321 has 4 divisors (see below), whose sum is σ = 66800752. Its totient is φ = 64835892.

The previous prime is 65818309. The next prime is 65818331. The reversal of 65818321 is 12381856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65818321 - 2⁹ = 65817809 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65818331) 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, 491115 + ... + 491248.

It is an arithmetic number, because the mean of its divisors is an integer number (16700188).

Almost surely, 2^65818321 is an apocalyptic number.

It is an amenable number.

65818321 is a deficient number, since it is larger than the sum of its proper divisors (982431).

65818321 is an equidigital number, since it uses as much as digits as its factorization.

65818321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982430.

The product of its digits is 11520, while the sum is 34.

The square root of 65818321 is about 8112.8491296215. The cubic root of 65818321 is about 403.7528489481.

The spelling of 65818321 in words is "sixty-five million, eight hundred eighteen thousand, three hundred twenty-one".