64824779521 has 2 divisors, whose sum is σ = 64824779522. Its totient is φ = 64824779520.

The previous prime is 64824779477. The next prime is 64824779531. The reversal of 64824779521 is 12597742846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53749321921 + 11075457600 = 231839^2 + 105240^2 .

It is a cyclic number.

It is not a de Polignac number, because 64824779521 - 2¹¹ = 64824777473 is a prime.

It is not a weakly prime, because it can be changed into another prime (64824779531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32412389760 + 32412389761.

It is an arithmetic number, because the mean of its divisors is an integer number (32412389761).

Almost surely, 2^64824779521 is an apocalyptic number.

It is an amenable number.

64824779521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64824779521 is an equidigital number, since it uses as much as digits as its factorization.

64824779521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 55.

The spelling of 64824779521 in words is "sixty-four billion, eight hundred twenty-four million, seven hundred seventy-nine thousand, five hundred twenty-one".