645118364016 has 240 divisors, whose sum is σ = 2101808779200. Its totient is φ = 180914798592.

The previous prime is 645118363997. The next prime is 645118364027. The reversal of 645118364016 is 610463811546.

645118364016 is a `hidden beast` number, since 6 + 4 + 511 + 83 + 6 + 40 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12264300 + ... + 12316788.

It is an arithmetic number, because the mean of its divisors is an integer number (8757536580).

Almost surely, 2^645118364016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645118364016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050904389600).

645118364016 is an abundant number, since it is smaller than the sum of its proper divisors (1456690415184).

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

645118364016 is a wasteful number, since it uses less digits than its factorization.

645118364016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52736 (or 52727 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 645118364016 in words is "six hundred forty-five billion, one hundred eighteen million, three hundred sixty-four thousand, sixteen".