640228124933 has 2 divisors, whose sum is σ = 640228124934. Its totient is φ = 640228124932.

The previous prime is 640228124917. The next prime is 640228125029. The reversal of 640228124933 is 339421822046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638645517409 + 1582607524 = 799153^2 + 39782^2 .

It is a cyclic number.

It is not a de Polignac number, because 640228124933 - 2⁴ = 640228124917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640228184933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320114062466 + 320114062467.

It is an arithmetic number, because the mean of its divisors is an integer number (320114062467).

Almost surely, 2^640228124933 is an apocalyptic number.

It is an amenable number.

640228124933 is a deficient number, since it is larger than the sum of its proper divisors (1).

640228124933 is an equidigital number, since it uses as much as digits as its factorization.

640228124933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 44.

Adding to 640228124933 its reverse (339421822046), we get a palindrome (979649946979).

The spelling of 640228124933 in words is "six hundred forty billion, two hundred twenty-eight million, one hundred twenty-four thousand, nine hundred thirty-three".