640533430664522 has 8 divisors (see below), whose sum is σ = 960802164883296. Its totient is φ = 320266042370092.

The previous prime is 640533430664509. The next prime is 640533430664551. The reversal of 640533430664522 is 225466034335046.

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 (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335290478 + ... + 337195449.

It is an arithmetic number, because the mean of its divisors is an integer number (120100270610412).

Almost surely, 2^{640533430664522} is an apocalyptic number.

640533430664522 is a deficient number, since it is larger than the sum of its proper divisors (320268734218774).

640533430664522 is a wasteful number, since it uses less digits than its factorization.

640533430664522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672962172.

The product of its (nonzero) digits is 37324800, while the sum is 53.

Adding to 640533430664522 its reverse (225466034335046), we get a palindrome (865999464999568).

The spelling of 640533430664522 in words is "six hundred forty trillion, five hundred thirty-three billion, four hundred thirty million, six hundred sixty-four thousand, five hundred twenty-two".