645464867 has 2 divisors, whose sum is σ = 645464868. Its totient is φ = 645464866.

The previous prime is 645464863. The next prime is 645464879. The reversal of 645464867 is 768464546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645464867 - 2² = 645464863 is a prime.

It is not a weakly prime, because it can be changed into another prime (645464863) 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, 322732433 + 322732434.

It is an arithmetic number, because the mean of its divisors is an integer number (322732434).

Almost surely, 2^645464867 is an apocalyptic number.

645464867 is a deficient number, since it is larger than the sum of its proper divisors (1).

645464867 is an equidigital number, since it uses as much as digits as its factorization.

645464867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 50.

The square root of 645464867 is about 25406.0006100921. Note that the first 3 decimals coincide. The cubic root of 645464867 is about 864.2197813901.

The spelling of 645464867 in words is "six hundred forty-five million, four hundred sixty-four thousand, eight hundred sixty-seven".