645758520748 has 24 divisors (see below), whose sum is σ = 1235282328000. Its totient is φ = 292938360720.

The previous prime is 645758520721. The next prime is 645758520751. The reversal of 645758520748 is 847025857546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14683786 + ... + 14727697.

It is an arithmetic number, because the mean of its divisors is an integer number (51470097000).

Almost surely, 2^645758520748 is an apocalyptic number.

It is an amenable number.

645758520748 is a deficient number, since it is larger than the sum of its proper divisors (589523807252).

645758520748 is a wasteful number, since it uses less digits than its factorization.

645758520748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29411997 (or 29411995 counting only the distinct ones).

The product of its (nonzero) digits is 75264000, while the sum is 61.

The spelling of 645758520748 in words is "six hundred forty-five billion, seven hundred fifty-eight million, five hundred twenty thousand, seven hundred forty-eight".