645245563116 has 192 divisors, whose sum is σ = 1946000609280. Its totient is φ = 161467434240.

The previous prime is 645245563099. The next prime is 645245563163. The reversal of 645245563116 is 611365542546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12487951 + ... + 12539513.

It is an arithmetic number, because the mean of its divisors is an integer number (10135419840).

Almost surely, 2^645245563116 is an apocalyptic number.

645245563116 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645245563116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973000304640).

645245563116 is an abundant number, since it is smaller than the sum of its proper divisors (1300755046164).

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

645245563116 is a wasteful number, since it uses less digits than its factorization.

645245563116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52084 (or 52082 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 48.

The spelling of 645245563116 in words is "six hundred forty-five billion, two hundred forty-five million, five hundred sixty-three thousand, one hundred sixteen".