64581238577 has 2 divisors, whose sum is σ = 64581238578. Its totient is φ = 64581238576.

The previous prime is 64581238571. The next prime is 64581238609. The reversal of 64581238577 is 77583218546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64536829681 + 44408896 = 254041^2 + 6664^2 .

It is a cyclic number.

It is not a de Polignac number, because 64581238577 - 2¹⁸ = 64580976433 is a prime.

It is a super-2 number, since 2×64581238577² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64581238571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32290619288 + 32290619289.

It is an arithmetic number, because the mean of its divisors is an integer number (32290619289).

Almost surely, 2^64581238577 is an apocalyptic number.

It is an amenable number.

64581238577 is a deficient number, since it is larger than the sum of its proper divisors (1).

64581238577 is an equidigital number, since it uses as much as digits as its factorization.

64581238577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11289600, while the sum is 56.

The spelling of 64581238577 in words is "sixty-four billion, five hundred eighty-one million, two hundred thirty-eight thousand, five hundred seventy-seven".