640142364560 has 160 divisors (see below), whose sum is σ = 1607853162240. Its totient is φ = 236293105664.

The previous prime is 640142364541. The next prime is 640142364569. The reversal of 640142364560 is 65463241046.

It is not an unprimeable number, because it can be changed into a prime (640142364569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81263342 + ... + 81271218.

It is an arithmetic number, because the mean of its divisors is an integer number (10049082264).

Almost surely, 2^640142364560 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 640142364560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803926581120).

640142364560 is an abundant number, since it is smaller than the sum of its proper divisors (967710797680).

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

640142364560 is a wasteful number, since it uses less digits than its factorization.

640142364560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9465 (or 9459 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 640142364560 in words is "six hundred forty billion, one hundred forty-two million, three hundred sixty-four thousand, five hundred sixty".