5645420647 has 2 divisors, whose sum is σ = 5645420648. Its totient is φ = 5645420646.

The previous prime is 5645420549. The next prime is 5645420653. The reversal of 5645420647 is 7460245465.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5645420647 - 2⁷ = 5645420519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5645420747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822710323 + 2822710324.

It is an arithmetic number, because the mean of its divisors is an integer number (2822710324).

Almost surely, 2^5645420647 is an apocalyptic number.

5645420647 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645420647 is an equidigital number, since it uses as much as digits as its factorization.

5645420647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 43.

The square root of 5645420647 is about 75136.0143140425. The cubic root of 5645420647 is about 1780.5961735502.

The spelling of 5645420647 in words is "five billion, six hundred forty-five million, four hundred twenty thousand, six hundred forty-seven".