645646342468 has 12 divisors (see below), whose sum is σ = 1143494125200. Its totient is φ = 318933735272.

The previous prime is 645646342463. The next prime is 645646342499. The reversal of 645646342468 is 864243646546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645646342463) 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 in 3 ways as a sum of consecutive naturals, for example, 972358618 + ... + 972359281.

It is an arithmetic number, because the mean of its divisors is an integer number (95291177100).

Almost surely, 2^645646342468 is an apocalyptic number.

It is an amenable number.

645646342468 is a deficient number, since it is larger than the sum of its proper divisors (497847782732).

645646342468 is a wasteful number, since it uses less digits than its factorization.

645646342468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944717986 (or 1944717984 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 58.

The spelling of 645646342468 in words is "six hundred forty-five billion, six hundred forty-six million, three hundred forty-two thousand, four hundred sixty-eight".