640321449296 has 20 divisors (see below), whose sum is σ = 1245200760384. Its totient is φ = 318979317600.

The previous prime is 640321449247. The next prime is 640321449343. The reversal of 640321449296 is 692944123046.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73833470 + ... + 73842141.

Almost surely, 2^640321449296 is an apocalyptic number.

It is an amenable number.

640321449296 is a deficient number, since it is larger than the sum of its proper divisors (604879311088).

640321449296 is a wasteful number, since it uses less digits than its factorization.

640321449296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147675890 (or 147675884 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 50.

The spelling of 640321449296 in words is "six hundred forty billion, three hundred twenty-one million, four hundred forty-nine thousand, two hundred ninety-six".