645926995200 has 864 divisors, whose sum is σ = 2375997926400. Its totient is φ = 153702236160.

The previous prime is 645926995159. The next prime is 645926995267. The reversal of 645926995200 is 2599629546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1043500491 + ... + 1043501109.

It is an arithmetic number, because the mean of its divisors is an integer number (2749997600).

Almost surely, 2^645926995200 is an apocalyptic number.

645926995200 is a gapful number since it is divisible by the number (60) 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 645926995200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1187998963200).

645926995200 is an abundant number, since it is smaller than the sum of its proper divisors (1730070931200).

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

645926995200 is a wasteful number, since it uses less digits than its factorization.

645926995200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 57.

The spelling of 645926995200 in words is "six hundred forty-five billion, nine hundred twenty-six million, nine hundred ninety-five thousand, two hundred".