640616503 has 2 divisors, whose sum is σ = 640616504. Its totient is φ = 640616502.

The previous prime is 640616497. The next prime is 640616527. The reversal of 640616503 is 305616046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640616503 - 2⁹ = 640615991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640616563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320308251 + 320308252.

It is an arithmetic number, because the mean of its divisors is an integer number (320308252).

Almost surely, 2^640616503 is an apocalyptic number.

640616503 is a deficient number, since it is larger than the sum of its proper divisors (1).

640616503 is an equidigital number, since it uses as much as digits as its factorization.

640616503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 640616503 is about 25310.4030588215. The cubic root of 640616503 is about 862.0504987615.

The spelling of 640616503 in words is "six hundred forty million, six hundred sixteen thousand, five hundred three".