640609033 has 2 divisors, whose sum is σ = 640609034. Its totient is φ = 640609032.

The previous prime is 640609031. The next prime is 640609103. The reversal of 640609033 is 330906046.

640609033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526610704 + 113998329 = 22948^2 + 10677^2 .

It is a cyclic number.

It is not a de Polignac number, because 640609033 - 2¹ = 640609031 is a prime.

It is a super-2 number, since 2×640609033² = 820759866322390178, which contains 22 as substring.

Together with 640609031, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 640608986 and 640609004.

It is not a weakly prime, because it can be changed into another prime (640609031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320304516 + 320304517.

It is an arithmetic number, because the mean of its divisors is an integer number (320304517).

Almost surely, 2^640609033 is an apocalyptic number.

It is an amenable number.

640609033 is a deficient number, since it is larger than the sum of its proper divisors (1).

640609033 is an equidigital number, since it uses as much as digits as its factorization.

640609033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 640609033 is about 25310.2554906109. The cubic root of 640609033 is about 862.0471480609.

The spelling of 640609033 in words is "six hundred forty million, six hundred nine thousand, thirty-three".