64856321 has 2 divisors, whose sum is σ = 64856322. Its totient is φ = 64856320.

The previous prime is 64856269. The next prime is 64856333. The reversal of 64856321 is 12365846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42719296 + 22137025 = 6536^2 + 4705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64856321 is a prime.

It is not a weakly prime, because it can be changed into another prime (64856221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32428160 + 32428161.

It is an arithmetic number, because the mean of its divisors is an integer number (32428161).

Almost surely, 2^64856321 is an apocalyptic number.

It is an amenable number.

64856321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64856321 is an equidigital number, since it uses as much as digits as its factorization.

64856321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 64856321 is about 8053.3422254366. The cubic root of 64856321 is about 401.7761040469.

The spelling of 64856321 in words is "sixty-four million, eight hundred fifty-six thousand, three hundred twenty-one".