645464179 has 2 divisors, whose sum is σ = 645464180. Its totient is φ = 645464178.

The previous prime is 645464159. The next prime is 645464201. The reversal of 645464179 is 971464546.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645464179 is a prime.

It is not a weakly prime, because it can be changed into another prime (645464159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322732089 + 322732090.

It is an arithmetic number, because the mean of its divisors is an integer number (322732090).

Almost surely, 2^645464179 is an apocalyptic number.

645464179 is a deficient number, since it is larger than the sum of its proper divisors (1).

645464179 is an equidigital number, since it uses as much as digits as its factorization.

645464179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The square root of 645464179 is about 25405.9870699802. The cubic root of 645464179 is about 864.2194743332.

The spelling of 645464179 in words is "six hundred forty-five million, four hundred sixty-four thousand, one hundred seventy-nine".