645785627 has 2 divisors, whose sum is σ = 645785628. Its totient is φ = 645785626.

The previous prime is 645785603. The next prime is 645785633. The reversal of 645785627 is 726587546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645785627 - 2¹² = 645781531 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645785677) 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, 322892813 + 322892814.

It is an arithmetic number, because the mean of its divisors is an integer number (322892814).

Almost surely, 2^645785627 is an apocalyptic number.

645785627 is a deficient number, since it is larger than the sum of its proper divisors (1).

645785627 is an equidigital number, since it uses as much as digits as its factorization.

645785627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2822400, while the sum is 50.

The square root of 645785627 is about 25412.3125079163. The cubic root of 645785627 is about 864.3629140093.

The spelling of 645785627 in words is "six hundred forty-five million, seven hundred eighty-five thousand, six hundred twenty-seven".