645864463 has 2 divisors, whose sum is σ = 645864464. Its totient is φ = 645864462.

The previous prime is 645864437. The next prime is 645864497. The reversal of 645864463 is 364468546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645864463 - 2¹³ = 645856271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645664463) 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, 322932231 + 322932232.

It is an arithmetic number, because the mean of its divisors is an integer number (322932232).

Almost surely, 2^645864463 is an apocalyptic number.

645864463 is a deficient number, since it is larger than the sum of its proper divisors (1).

645864463 is an equidigital number, since it uses as much as digits as its factorization.

645864463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 46.

The square root of 645864463 is about 25413.8635984378. The cubic root of 645864463 is about 864.3980857128.

The spelling of 645864463 in words is "six hundred forty-five million, eight hundred sixty-four thousand, four hundred sixty-three".