640148341888 has 128 divisors (see below), whose sum is σ = 1425214828800. Its totient is φ = 283950289920.

The previous prime is 640148341871. The next prime is 640148341901. The reversal of 640148341888 is 888143841046.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10062243 + ... + 10125661.

It is an arithmetic number, because the mean of its divisors is an integer number (11134490850).

Almost surely, 2^640148341888 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 640148341888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712607414400).

640148341888 is an abundant number, since it is smaller than the sum of its proper divisors (785066486912).

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

640148341888 is a wasteful number, since it uses less digits than its factorization.

640148341888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63618 (or 63606 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 55.

The spelling of 640148341888 in words is "six hundred forty billion, one hundred forty-eight million, three hundred forty-one thousand, eight hundred eighty-eight".