5644620457281 has 27 divisors (see below), whose sum is σ = 8828910259299. Its totient is φ = 3473555568912.

The previous prime is 5644620457271. The next prime is 5644620457291. The reversal of 5644620457281 is 1827540264465.

The square root of 5644620457281 is 2375841.

It is a perfect power (a square), and thus also a powerful number.

5644620457281 is a `hidden beast` number, since 5 + 6 + 4 + 4 + 62 + 0 + 4 + 572 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (5644620457271) and next prime (5644620457291).

It can be written as a sum of positive squares in only one way, i.e., 835003026225 + 4809617431056 = 913785^2 + 2193084^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5644620457281 is a prime.

It is a super-2 number, since 2×5644620457281² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5644620457261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 92627340 + ... + 92688258.

Almost surely, 2^{5644620457281} is an apocalyptic number.

5644620457281 is the 2375841-st square number.

5644620457281 is the 1187921-st centered octagonal number.

It is an amenable number.

5644620457281 is a deficient number, since it is larger than the sum of its proper divisors (3184289802018).

5644620457281 is an frugal number, since it uses more digits than its factorization.

5644620457281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121870 (or 60935 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 54.

The spelling of 5644620457281 in words is "five trillion, six hundred forty-four billion, six hundred twenty million, four hundred fifty-seven thousand, two hundred eighty-one".