64273037281 has 2 divisors, whose sum is σ = 64273037282. Its totient is φ = 64273037280.

The previous prime is 64273037239. The next prime is 64273037291. The reversal of 64273037281 is 18273037246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40367239056 + 23905798225 = 200916^2 + 154615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64273037281 is a prime.

It is a super-2 number, since 2×64273037281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64273037201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32136518640 + 32136518641.

It is an arithmetic number, because the mean of its divisors is an integer number (32136518641).

Almost surely, 2^64273037281 is an apocalyptic number.

It is an amenable number.

64273037281 is a deficient number, since it is larger than the sum of its proper divisors (1).

64273037281 is an equidigital number, since it uses as much as digits as its factorization.

64273037281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 64273037281 in words is "sixty-four billion, two hundred seventy-three million, thirty-seven thousand, two hundred eighty-one".