645434500624 has 20 divisors (see below), whose sum is σ = 1250550758736. Its totient is φ = 322711724192.

The previous prime is 645434500621. The next prime is 645434500631. The reversal of 645434500624 is 426005434546.

It is not an unprimeable number, because it can be changed into a prime (645434500621) 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, 717267 + ... + 1343629.

Almost surely, 2^645434500624 is an apocalyptic number.

It is an amenable number.

645434500624 is a deficient number, since it is larger than the sum of its proper divisors (605116258112).

645434500624 is a wasteful number, since it uses less digits than its factorization.

645434500624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690774 (or 690768 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 43.

The spelling of 645434500624 in words is "six hundred forty-five billion, four hundred thirty-four million, five hundred thousand, six hundred twenty-four".