640154711120 has 20 divisors (see below), whose sum is σ = 1488359703540. Its totient is φ = 256061884416.

The previous prime is 640154711111. The next prime is 640154711137. The reversal of 640154711120 is 21117451046.

It can be written as a sum of positive squares in 2 ways, for example, as 424806739984 + 215347971136 = 651772^2 + 464056^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4000966865 + ... + 4000967024.

It is an arithmetic number, because the mean of its divisors is an integer number (74417985177).

Almost surely, 2^640154711120 is an apocalyptic number.

It is an amenable number.

640154711120 is an abundant number, since it is smaller than the sum of its proper divisors (848204992420).

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

640154711120 is a wasteful number, since it uses less digits than its factorization.

640154711120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8001933902 (or 8001933896 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 640154711120 in words is "six hundred forty billion, one hundred fifty-four million, seven hundred eleven thousand, one hundred twenty".