640324335251 has 2 divisors, whose sum is σ = 640324335252. Its totient is φ = 640324335250.

The previous prime is 640324335199. The next prime is 640324335253. The reversal of 640324335251 is 152533423046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640324335251 - 2¹⁴ = 640324318867 is a prime.

Together with 640324335253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640324335253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320162167625 + 320162167626.

It is an arithmetic number, because the mean of its divisors is an integer number (320162167626).

Almost surely, 2^640324335251 is an apocalyptic number.

640324335251 is a deficient number, since it is larger than the sum of its proper divisors (1).

640324335251 is an equidigital number, since it uses as much as digits as its factorization.

640324335251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 640324335251 its reverse (152533423046), we get a palindrome (792857758297).

The spelling of 640324335251 in words is "six hundred forty billion, three hundred twenty-four million, three hundred thirty-five thousand, two hundred fifty-one".