640113320849208 has 64 divisors (see below), whose sum is σ = 1628224192116000. Its totient is φ = 209652995758080.

The previous prime is 640113320849111. The next prime is 640113320849209. The reversal of 640113320849208 is 802948023311046.

It is a super-2 number, since 2×640113320849208² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640113320849209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228004533 + ... + 230794916.

Almost surely, 2^{640113320849208} is an apocalyptic number.

It is an amenable number.

640113320849208 is an abundant number, since it is smaller than the sum of its proper divisors (988110871266792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640113320849208 is a wasteful number, since it uses less digits than its factorization.

640113320849208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458800472 (or 458800468 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 640113320849208 in words is "six hundred forty trillion, one hundred thirteen billion, three hundred twenty million, eight hundred forty-nine thousand, two hundred eight".