640665303302 has 64 divisors (see below), whose sum is σ = 1008776070144. Its totient is φ = 304927096320.

The previous prime is 640665303259. The next prime is 640665303307. The reversal of 640665303302 is 203303566046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640665303307) 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, 201402152 + ... + 201405332.

It is an arithmetic number, because the mean of its divisors is an integer number (15762126096).

Almost surely, 2^640665303302 is an apocalyptic number.

640665303302 is a deficient number, since it is larger than the sum of its proper divisors (368110766842).

640665303302 is a wasteful number, since it uses less digits than its factorization.

640665303302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3693.

The product of its (nonzero) digits is 233280, while the sum is 38.

Adding to 640665303302 its reverse (203303566046), we get a palindrome (843968869348).

The spelling of 640665303302 in words is "six hundred forty billion, six hundred sixty-five million, three hundred three thousand, three hundred two".