645116625500 has 24 divisors (see below), whose sum is σ = 1408934711184. Its totient is φ = 258046650000.

The previous prime is 645116625499. The next prime is 645116625539. The reversal of 645116625500 is 5526611546.

It is a congruent number.

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, 645116126 + ... + 645117125.

It is an arithmetic number, because the mean of its divisors is an integer number (58705612966).

Almost surely, 2^645116625500 is an apocalyptic number.

It is an amenable number.

645116625500 is an abundant number, since it is smaller than the sum of its proper divisors (763818085684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645116625500 is a wasteful number, since it uses less digits than its factorization.

645116625500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290233270 (or 1290233258 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 645116625500 in words is "six hundred forty-five billion, one hundred sixteen million, six hundred twenty-five thousand, five hundred".