640775507511 has 8 divisors (see below), whose sum is σ = 854403835120. Its totient is φ = 427165425792.

The previous prime is 640775507503. The next prime is 640775507513. The reversal of 640775507511 is 115705577046.

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

It is not a de Polignac number, because 640775507511 - 2³ = 640775507503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640775507513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4479316 + ... + 4620153.

It is an arithmetic number, because the mean of its divisors is an integer number (106800479390).

Almost surely, 2^640775507511 is an apocalyptic number.

640775507511 is a deficient number, since it is larger than the sum of its proper divisors (213628327609).

640775507511 is a wasteful number, since it uses less digits than its factorization.

640775507511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9122945.

The product of its (nonzero) digits is 1029000, while the sum is 48.

The spelling of 640775507511 in words is "six hundred forty billion, seven hundred seventy-five million, five hundred seven thousand, five hundred eleven".