640530660007700 has 288 divisors, whose sum is σ = 1835260883285760. Its totient is φ = 187861342003200.

The previous prime is 640530660007699. The next prime is 640530660007727. The reversal of 640530660007700 is 7700066035046.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 606455666 + ... + 607510934.

It is an arithmetic number, because the mean of its divisors is an integer number (6372433622520).

Almost surely, 2^{640530660007700} 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 640530660007700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917630441642880).

640530660007700 is an abundant number, since it is smaller than the sum of its proper divisors (1194730223278060).

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

640530660007700 is a wasteful number, since it uses less digits than its factorization.

640530660007700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059955 (or 1059948 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 44.

The spelling of 640530660007700 in words is "six hundred forty trillion, five hundred thirty billion, six hundred sixty million, seven thousand, seven hundred".