640175740568 has 256 divisors, whose sum is σ = 1604800512000. Its totient is φ = 237068052480.

The previous prime is 640175740493. The next prime is 640175740577. The reversal of 640175740568 is 865047571046.

It is a congruent 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, 115824221 + ... + 115829747.

It is an arithmetic number, because the mean of its divisors is an integer number (6268752000).

Almost surely, 2^640175740568 is an apocalyptic number.

640175740568 is a gapful number since it is divisible by the number (68) 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 640175740568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802400256000).

640175740568 is an abundant number, since it is smaller than the sum of its proper divisors (964624771432).

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

640175740568 is a wasteful number, since it uses less digits than its factorization.

640175740568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775 (or 5757 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 640175740568 in words is "six hundred forty billion, one hundred seventy-five million, seven hundred forty thousand, five hundred sixty-eight".