5645088721 has 2 divisors, whose sum is σ = 5645088722. Its totient is φ = 5645088720.

The previous prime is 5645088653. The next prime is 5645088749. The reversal of 5645088721 is 1278805465.

5645088721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5459584321 + 185504400 = 73889^2 + 13620^2 .

It is a cyclic number.

It is not a de Polignac number, because 5645088721 - 2²⁵ = 5611534289 is a prime.

It is a super-2 number, since 2×5645088721² = 63734053335922831682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5645088751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822544360 + 2822544361.

It is an arithmetic number, because the mean of its divisors is an integer number (2822544361).

Almost surely, 2^5645088721 is an apocalyptic number.

It is an amenable number.

5645088721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645088721 is an equidigital number, since it uses as much as digits as its factorization.

5645088721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 537600, while the sum is 46.

The square root of 5645088721 is about 75133.8054473484. The cubic root of 5645088721 is about 1780.5612757817.

The spelling of 5645088721 in words is "five billion, six hundred forty-five million, eighty-eight thousand, seven hundred twenty-one".