640321449297 has 16 divisors (see below), whose sum is σ = 855664091520. Its totient is φ = 425930798592.

The previous prime is 640321449247. The next prime is 640321449343. The reversal of 640321449297 is 792944123046.

It is a happy number.

It is not a de Polignac number, because 640321449297 - 2³⁸ = 365443542353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640321449247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2721729 + ... + 2947617.

It is an arithmetic number, because the mean of its divisors is an integer number (53479005720).

Almost surely, 2^640321449297 is an apocalyptic number.

It is an amenable number.

640321449297 is a deficient number, since it is larger than the sum of its proper divisors (215342642223).

640321449297 is a wasteful number, since it uses less digits than its factorization.

640321449297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227992.

The product of its (nonzero) digits is 2612736, while the sum is 51.

The spelling of 640321449297 in words is "six hundred forty billion, three hundred twenty-one million, four hundred forty-nine thousand, two hundred ninety-seven".