640521604050506 has 8 divisors (see below), whose sum is σ = 970295103165924. Its totient is φ = 317089902995200.

The previous prime is 640521604050473. The next prime is 640521604050511. The reversal of 640521604050506 is 605050406125046.

It can be written as a sum of positive squares in 2 ways, for example, as 637103487146281 + 3418116904225 = 25240909^2 + 1848815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 1585449514775 + ... + 1585449515178.

Almost surely, 2^{640521604050506} is an apocalyptic number.

640521604050506 is a deficient number, since it is larger than the sum of its proper divisors (329773499115418).

640521604050506 is a wasteful number, since it uses less digits than its factorization.

640521604050506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170899030056.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 640521604050506 in words is "six hundred forty trillion, five hundred twenty-one billion, six hundred four million, fifty thousand, five hundred six".