640713205203 has 4 divisors (see below), whose sum is σ = 854284273608. Its totient is φ = 427142136800.

The previous prime is 640713205183. The next prime is 640713205213. The reversal of 640713205203 is 302502317046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640713205203 - 2¹⁰ = 640713204179 is a prime.

It is a super-2 number, since 2×640713205203² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640713205213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106785534198 + ... + 106785534203.

It is an arithmetic number, because the mean of its divisors is an integer number (213571068402).

Almost surely, 2^640713205203 is an apocalyptic number.

640713205203 is a deficient number, since it is larger than the sum of its proper divisors (213571068405).

640713205203 is a wasteful number, since it uses less digits than its factorization.

640713205203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213571068404.

The product of its (nonzero) digits is 30240, while the sum is 33.

The spelling of 640713205203 in words is "six hundred forty billion, seven hundred thirteen million, two hundred five thousand, two hundred three".