5645428251 has 4 divisors (see below), whose sum is σ = 7527237672. Its totient is φ = 3763618832.

The previous prime is 5645428237. The next prime is 5645428267. The reversal of 5645428251 is 1528245465.

5645428251 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5645428251 - 2¹⁷ = 5645297179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5645428351) 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 in 3 ways as a sum of consecutive naturals, for example, 940904706 + ... + 940904711.

It is an arithmetic number, because the mean of its divisors is an integer number (1881809418).

Almost surely, 2^5645428251 is an apocalyptic number.

5645428251 is a deficient number, since it is larger than the sum of its proper divisors (1881809421).

5645428251 is a wasteful number, since it uses less digits than its factorization.

5645428251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881809420.

The product of its digits is 384000, while the sum is 42.

The square root of 5645428251 is about 75136.0649155916. The cubic root of 5645428251 is about 1780.5969729974.

The spelling of 5645428251 in words is "five billion, six hundred forty-five million, four hundred twenty-eight thousand, two hundred fifty-one".