640461113605 has 8 divisors (see below), whose sum is σ = 768561300000. Its totient is φ = 512363581776.

The previous prime is 640461113603. The next prime is 640461113627. The reversal of 640461113605 is 506311164046.

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

It is a cyclic number.

It is not a de Polignac number, because 640461113605 - 2¹ = 640461113603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640461113603) 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 7 ways as a sum of consecutive naturals, for example, 87355 + ... + 1135144.

It is an arithmetic number, because the mean of its divisors is an integer number (96070162500).

Almost surely, 2^640461113605 is an apocalyptic number.

It is an amenable number.

640461113605 is a deficient number, since it is larger than the sum of its proper divisors (128100186395).

640461113605 is a wasteful number, since it uses less digits than its factorization.

640461113605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327283.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 640461113605 in words is "six hundred forty billion, four hundred sixty-one million, one hundred thirteen thousand, six hundred five".