645554579 has 2 divisors, whose sum is σ = 645554580. Its totient is φ = 645554578.

The previous prime is 645554573. The next prime is 645554599. The reversal of 645554579 is 975455546.

645554579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645554579 - 2⁴ = 645554563 is a prime.

It is not a weakly prime, because it can be changed into another prime (645554573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322777289 + 322777290.

It is an arithmetic number, because the mean of its divisors is an integer number (322777290).

Almost surely, 2^645554579 is an apocalyptic number.

645554579 is a deficient number, since it is larger than the sum of its proper divisors (1).

645554579 is an equidigital number, since it uses as much as digits as its factorization.

645554579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780000, while the sum is 50.

The square root of 645554579 is about 25407.7661158946. The cubic root of 645554579 is about 864.2598183192.

The spelling of 645554579 in words is "six hundred forty-five million, five hundred fifty-four thousand, five hundred seventy-nine".