640885183 has 2 divisors, whose sum is σ = 640885184. Its totient is φ = 640885182.

The previous prime is 640885163. The next prime is 640885211. The reversal of 640885183 is 381588046.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640885183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640885153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320442591 + 320442592.

It is an arithmetic number, because the mean of its divisors is an integer number (320442592).

Almost surely, 2^640885183 is an apocalyptic number.

640885183 is a deficient number, since it is larger than the sum of its proper divisors (1).

640885183 is an equidigital number, since it uses as much as digits as its factorization.

640885183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 640885183 is about 25315.7102013750. The cubic root of 640885183 is about 862.1709990160.

The spelling of 640885183 in words is "six hundred forty million, eight hundred eighty-five thousand, one hundred eighty-three".