645269467 has 2 divisors, whose sum is σ = 645269468. Its totient is φ = 645269466.

The previous prime is 645269453. The next prime is 645269477. The reversal of 645269467 is 764962546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645269467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645269467.

It is not a weakly prime, because it can be changed into another prime (645269477) 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, 322634733 + 322634734.

It is an arithmetic number, because the mean of its divisors is an integer number (322634734).

Almost surely, 2^645269467 is an apocalyptic number.

645269467 is a deficient number, since it is larger than the sum of its proper divisors (1).

645269467 is an equidigital number, since it uses as much as digits as its factorization.

645269467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 49.

The square root of 645269467 is about 25402.1547708064. The cubic root of 645269467 is about 864.1325648752.

The spelling of 645269467 in words is "six hundred forty-five million, two hundred sixty-nine thousand, four hundred sixty-seven".