64842264581 has 2 divisors, whose sum is σ = 64842264582. Its totient is φ = 64842264580.

The previous prime is 64842264577. The next prime is 64842264587. The reversal of 64842264581 is 18546224846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33205950625 + 31636313956 = 182225^2 + 177866^2 .

It is a cyclic number.

It is not a de Polignac number, because 64842264581 - 2² = 64842264577 is a prime.

It is a super-2 number, since 2×64842264581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64842264587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32421132290 + 32421132291.

It is an arithmetic number, because the mean of its divisors is an integer number (32421132291).

Almost surely, 2^64842264581 is an apocalyptic number.

It is an amenable number.

64842264581 is a deficient number, since it is larger than the sum of its proper divisors (1).

64842264581 is an equidigital number, since it uses as much as digits as its factorization.

64842264581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2949120, while the sum is 50.

The spelling of 64842264581 in words is "sixty-four billion, eight hundred forty-two million, two hundred sixty-four thousand, five hundred eighty-one".