640642160315 has 4 divisors (see below), whose sum is σ = 768770592384. Its totient is φ = 512513728248.

The previous prime is 640642160311. The next prime is 640642160393. The reversal of 640642160315 is 513061246046.

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 640642160315 - 2² = 640642160311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640642160311) by changing a digit.

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, 64064216027 + ... + 64064216036.

It is an arithmetic number, because the mean of its divisors is an integer number (192192648096).

Almost surely, 2^640642160315 is an apocalyptic number.

640642160315 is a deficient number, since it is larger than the sum of its proper divisors (128128432069).

640642160315 is a wasteful number, since it uses less digits than its factorization.

640642160315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128128432068.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 640642160315 in words is "six hundred forty billion, six hundred forty-two million, one hundred sixty thousand, three hundred fifteen".