64851839321 has 2 divisors, whose sum is σ = 64851839322. Its totient is φ = 64851839320.

The previous prime is 64851839291. The next prime is 64851839363. The reversal of 64851839321 is 12393815846.

It is a happy number.

64851839321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48483195721 + 16368643600 = 220189^2 + 127940^2 .

It is a cyclic number.

It is not a de Polignac number, because 64851839321 - 2¹⁰ = 64851838297 is a prime.

It is a super-2 number, since 2×64851839321² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64851839321.

It is not a weakly prime, because it can be changed into another prime (64851838321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32425919660 + 32425919661.

It is an arithmetic number, because the mean of its divisors is an integer number (32425919661).

Almost surely, 2^64851839321 is an apocalyptic number.

It is an amenable number.

64851839321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64851839321 is an equidigital number, since it uses as much as digits as its factorization.

64851839321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 50.

The spelling of 64851839321 in words is "sixty-four billion, eight hundred fifty-one million, eight hundred thirty-nine thousand, three hundred twenty-one".