640533430664315 has 4 divisors (see below), whose sum is σ = 768640116797184. Its totient is φ = 512426744531448.

The previous prime is 640533430664311. The next prime is 640533430664377. The reversal of 640533430664315 is 513466034335046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640533430664315 - 2² = 640533430664311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640533430664311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64053343066427 + ... + 64053343066436.

It is an arithmetic number, because the mean of its divisors is an integer number (192160029199296).

Almost surely, 2^{640533430664315} is an apocalyptic number.

640533430664315 is a deficient number, since it is larger than the sum of its proper divisors (128106686132869).

640533430664315 is a wasteful number, since it uses less digits than its factorization.

640533430664315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128106686132868.

The product of its (nonzero) digits is 27993600, while the sum is 53.

The spelling of 640533430664315 in words is "six hundred forty trillion, five hundred thirty-three billion, four hundred thirty million, six hundred sixty-four thousand, three hundred fifteen".