645613210000 has 200 divisors, whose sum is σ = 1722106349568. Its totient is φ = 232440000000.

The previous prime is 645613209977. The next prime is 645613210009. The reversal of 645613210000 is 12316546.

It is a tau number, because it is divible by the number of its divisors (200).

It is not an unprimeable number, because it can be changed into a prime (645613210009) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 11080945 + ... + 11139055.

Almost surely, 2^645613210000 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 645613210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861053174784).

645613210000 is an abundant number, since it is smaller than the sum of its proper divisors (1076493139568).

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

645613210000 is a wasteful number, since it uses less digits than its factorization.

645613210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58251 (or 58230 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 645613210000 its reverse (12316546), we get a palindrome (645625526546).

The spelling of 645613210000 in words is "six hundred forty-five billion, six hundred thirteen million, two hundred ten thousand".