645463042144 has 24 divisors (see below), whose sum is σ = 1326005598960. Its totient is φ = 308699715456.

The previous prime is 645463042139. The next prime is 645463042151. The reversal of 645463042144 is 441240364546.

It is a self number, because there is not a number n which added to its sum of digits gives 645463042144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438493179 + ... + 438494650.

It is an arithmetic number, because the mean of its divisors is an integer number (55250233290).

Almost surely, 2^645463042144 is an apocalyptic number.

It is an amenable number.

645463042144 is an abundant number, since it is smaller than the sum of its proper divisors (680542556816).

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

645463042144 is a wasteful number, since it uses less digits than its factorization.

645463042144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876987862 (or 876987854 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 43.

The spelling of 645463042144 in words is "six hundred forty-five billion, four hundred sixty-three million, forty-two thousand, one hundred forty-four".