640300665 has 32 divisors (see below), whose sum is σ = 1141845120. Its totient is φ = 304487424.

The previous prime is 640300663. The next prime is 640300667. The reversal of 640300665 is 566003046.

640300665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640300663) and next prime (640300667).

It is not a de Polignac number, because 640300665 - 2¹ = 640300663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640300663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61234 + ... + 70923.

It is an arithmetic number, because the mean of its divisors is an integer number (35682660).

Almost surely, 2^640300665 is an apocalyptic number.

It is an amenable number.

640300665 is a deficient number, since it is larger than the sum of its proper divisors (501544455).

640300665 is a wasteful number, since it uses less digits than its factorization.

640300665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132201.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 640300665 is about 25304.1629974200. The cubic root of 640300665 is about 861.9088055326.

The spelling of 640300665 in words is "six hundred forty million, three hundred thousand, six hundred sixty-five".