645302751520 has 192 divisors, whose sum is σ = 1753494462720. Its totient is φ = 219832123392.

The previous prime is 645302751481. The next prime is 645302751529. The reversal of 645302751520 is 25157203546.

It is a super-2 number, since 2×645302751520² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (645302751529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115871296 + ... + 115876864.

It is an arithmetic number, because the mean of its divisors is an integer number (9132783660).

Almost surely, 2^645302751520 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 645302751520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (876747231360).

645302751520 is an abundant number, since it is smaller than the sum of its proper divisors (1108191711200).

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

645302751520 is a wasteful number, since it uses less digits than its factorization.

645302751520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6235 (or 6227 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 645302751520 in words is "six hundred forty-five billion, three hundred two million, seven hundred fifty-one thousand, five hundred twenty".