640566353200 has 30 divisors (see below), whose sum is σ = 1538960664524. Its totient is φ = 256226541120.

The previous prime is 640566353197. The next prime is 640566353237. The reversal of 640566353200 is 2353665046.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 800707542 + ... + 800708341.

Almost surely, 2^640566353200 is an apocalyptic number.

It is an amenable number.

640566353200 is an abundant number, since it is smaller than the sum of its proper divisors (898394311324).

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

640566353200 is a wasteful number, since it uses less digits than its factorization.

640566353200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601415901 (or 1601415890 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 40.

The spelling of 640566353200 in words is "six hundred forty billion, five hundred sixty-six million, three hundred fifty-three thousand, two hundred".