640545203 has 2 divisors, whose sum is σ = 640545204. Its totient is φ = 640545202.

The previous prime is 640545181. The next prime is 640545211. The reversal of 640545203 is 302545046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640545203 - 2¹⁶ = 640479667 is a prime.

It is a super-2 number, since 2×640545203² = 820596314172622418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640545263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320272601 + 320272602.

It is an arithmetic number, because the mean of its divisors is an integer number (320272602).

Almost surely, 2^640545203 is an apocalyptic number.

640545203 is a deficient number, since it is larger than the sum of its proper divisors (1).

640545203 is an equidigital number, since it uses as much as digits as its factorization.

640545203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 640545203 is about 25308.9945078820. The cubic root of 640545203 is about 862.0185157781.

The spelling of 640545203 in words is "six hundred forty million, five hundred forty-five thousand, two hundred three".