640266183 has 12 divisors (see below), whose sum is σ = 925601040. Its totient is φ = 426487776.

The previous prime is 640266163. The next prime is 640266197. The reversal of 640266183 is 381662046.

640266183 is a `hidden beast` number, since 640 + 2 + 6 + 6 + 1 + 8 + 3 = 666.

It is not a de Polignac number, because 640266183 - 2¹⁸ = 640004039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640266103) 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 in 11 ways as a sum of consecutive naturals, for example, 18078 + ... + 40091.

It is an arithmetic number, because the mean of its divisors is an integer number (77133420).

Almost surely, 2^640266183 is an apocalyptic number.

640266183 is a deficient number, since it is larger than the sum of its proper divisors (285334857).

640266183 is a wasteful number, since it uses less digits than its factorization.

640266183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59398 (or 59395 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 640266183 is about 25303.4816379090. The cubic root of 640266183 is about 861.8933331800.

The spelling of 640266183 in words is "six hundred forty million, two hundred sixty-six thousand, one hundred eighty-three".