5645355281 has 2 divisors, whose sum is σ = 5645355282. Its totient is φ = 5645355280.

The previous prime is 5645355277. The next prime is 5645355293. The reversal of 5645355281 is 1825535465.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3549180625 + 2096174656 = 59575^2 + 45784^2 .

It is a cyclic number.

It is not a de Polignac number, because 5645355281 - 2² = 5645355277 is a prime.

It is a super-2 number, since 2×5645355281² = 63740072497429177922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5645355241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822677640 + 2822677641.

It is an arithmetic number, because the mean of its divisors is an integer number (2822677641).

Almost surely, 2^5645355281 is an apocalyptic number.

It is an amenable number.

5645355281 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645355281 is an equidigital number, since it uses as much as digits as its factorization.

5645355281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720000, while the sum is 44.

The square root of 5645355281 is about 75135.5793283049. The cubic root of 5645355281 is about 1780.5893012605.

The spelling of 5645355281 in words is "five billion, six hundred forty-five million, three hundred fifty-five thousand, two hundred eighty-one".