645325787 has 2 divisors, whose sum is σ = 645325788. Its totient is φ = 645325786.

The previous prime is 645325741. The next prime is 645325819. The reversal of 645325787 is 787523546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645325787 - 2⁸ = 645325531 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645325687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322662893 + 322662894.

It is an arithmetic number, because the mean of its divisors is an integer number (322662894).

Almost surely, 2^645325787 is an apocalyptic number.

645325787 is a deficient number, since it is larger than the sum of its proper divisors (1).

645325787 is an equidigital number, since it uses as much as digits as its factorization.

645325787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 47.

The square root of 645325787 is about 25403.2633139918. The cubic root of 645325787 is about 864.1577050338.

The spelling of 645325787 in words is "six hundred forty-five million, three hundred twenty-five thousand, seven hundred eighty-seven".