640508577833 has 2 divisors, whose sum is σ = 640508577834. Its totient is φ = 640508577832.

The previous prime is 640508577817. The next prime is 640508577853. The reversal of 640508577833 is 338775805046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616795041769 + 23713536064 = 785363^2 + 153992^2 .

It is a cyclic number.

It is not a de Polignac number, because 640508577833 - 2⁴ = 640508577817 is a prime.

It is not a weakly prime, because it can be changed into another prime (640508577853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320254288916 + 320254288917.

It is an arithmetic number, because the mean of its divisors is an integer number (320254288917).

Almost surely, 2^640508577833 is an apocalyptic number.

It is an amenable number.

640508577833 is a deficient number, since it is larger than the sum of its proper divisors (1).

640508577833 is an equidigital number, since it uses as much as digits as its factorization.

640508577833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 640508577833 in words is "six hundred forty billion, five hundred eight million, five hundred seventy-seven thousand, eight hundred thirty-three".