645717287712 has 192 divisors, whose sum is σ = 1979617812480. Its totient is φ = 180451255296.

The previous prime is 645717287669. The next prime is 645717287729. The reversal of 645717287712 is 217782717546.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58330114 + ... + 58341182.

It is an arithmetic number, because the mean of its divisors is an integer number (10310509440).

Almost surely, 2^645717287712 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 645717287712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (989808906240).

645717287712 is an abundant number, since it is smaller than the sum of its proper divisors (1333900524768).

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

645717287712 is a wasteful number, since it uses less digits than its factorization.

645717287712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12983 (or 12975 counting only the distinct ones).

The product of its digits is 9219840, while the sum is 57.

The spelling of 645717287712 in words is "six hundred forty-five billion, seven hundred seventeen million, two hundred eighty-seven thousand, seven hundred twelve".