640643203011 has 16 divisors (see below), whose sum is σ = 976735065600. Its totient is φ = 365888011008.

The previous prime is 640643203001. The next prime is 640643203019. The reversal of 640643203011 is 110302346046.

It is not a de Polignac number, because 640643203011 - 2¹⁹ = 640642678723 is a prime.

It is a super-2 number, since 2×640643203011² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640643203011.

It is not an unprimeable number, because it can be changed into a prime (640643203019) 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 15 ways as a sum of consecutive naturals, for example, 8035191 + ... + 8114528.

It is an arithmetic number, because the mean of its divisors is an integer number (61045941600).

Almost surely, 2^640643203011 is an apocalyptic number.

640643203011 is a deficient number, since it is larger than the sum of its proper divisors (336091862589).

640643203011 is a wasteful number, since it uses less digits than its factorization.

640643203011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16151618.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 640643203011 its reverse (110302346046), we get a palindrome (750945549057).

The spelling of 640643203011 in words is "six hundred forty billion, six hundred forty-three million, two hundred three thousand, eleven".