640983108672 has 140 divisors (see below), whose sum is σ = 2000078976720. Its totient is φ = 202415687424.

The previous prime is 640983108671. The next prime is 640983108677. The reversal of 640983108672 is 276801389046.

640983108672 is a `hidden beast` number, since 6 + 409 + 83 + 10 + 86 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (640983108671) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3155358 + ... + 3352349.

Almost surely, 2^640983108672 is an apocalyptic number.

It is an amenable number.

640983108672 is an abundant number, since it is smaller than the sum of its proper divisors (1359095868048).

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

640983108672 is a wasteful number, since it uses less digits than its factorization.

640983108672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6507750 (or 6507731 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 640983108672 in words is "six hundred forty billion, nine hundred eighty-three million, one hundred eight thousand, six hundred seventy-two".