645468871548 has 12 divisors (see below), whose sum is σ = 1506094033640. Its totient is φ = 215156290512.

The previous prime is 645468871543. The next prime is 645468871573. The reversal of 645468871548 is 845178864546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645468871543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26894536303 + ... + 26894536326.

Almost surely, 2^645468871548 is an apocalyptic number.

It is an amenable number.

645468871548 is an abundant number, since it is smaller than the sum of its proper divisors (860625162092).

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

645468871548 is a wasteful number, since it uses less digits than its factorization.

645468871548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53789072636 (or 53789072634 counting only the distinct ones).

The product of its digits is 206438400, while the sum is 66.

The spelling of 645468871548 in words is "six hundred forty-five billion, four hundred sixty-eight million, eight hundred seventy-one thousand, five hundred forty-eight".