640355134602 has 32 divisors (see below), whose sum is σ = 1331530416000. Its totient is φ = 205055661888.

The previous prime is 640355134589. The next prime is 640355134607. The reversal of 640355134602 is 206431553046.

It is a super-2 number, since 2×640355134602² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640355134607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9212113 + ... + 9281364.

It is an arithmetic number, because the mean of its divisors is an integer number (41610325500).

Almost surely, 2^640355134602 is an apocalyptic number.

640355134602 is an abundant number, since it is smaller than the sum of its proper divisors (691175281398).

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

640355134602 is a wasteful number, since it uses less digits than its factorization.

640355134602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18493710.

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 640355134602 its reverse (206431553046), we get a palindrome (846786687648).

The spelling of 640355134602 in words is "six hundred forty billion, three hundred fifty-five million, one hundred thirty-four thousand, six hundred two".