64567725281 has 2 divisors, whose sum is σ = 64567725282. Its totient is φ = 64567725280.

The previous prime is 64567725221. The next prime is 64567725371. The reversal of 64567725281 is 18252776546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44369630881 + 20198094400 = 210641^2 + 142120^2 .

It is a cyclic number.

It is not a de Polignac number, because 64567725281 - 2¹⁸ = 64567463137 is a prime.

It is a super-2 number, since 2×64567725281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64567725221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32283862640 + 32283862641.

It is an arithmetic number, because the mean of its divisors is an integer number (32283862641).

Almost surely, 2^64567725281 is an apocalyptic number.

It is an amenable number.

64567725281 is a deficient number, since it is larger than the sum of its proper divisors (1).

64567725281 is an equidigital number, since it uses as much as digits as its factorization.

64567725281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5644800, while the sum is 53.

The spelling of 64567725281 in words is "sixty-four billion, five hundred sixty-seven million, seven hundred twenty-five thousand, two hundred eighty-one".