640505602411565 has 16 divisors (see below), whose sum is σ = 843820698683520. Its totient is φ = 462855235552320.

The previous prime is 640505602411529. The next prime is 640505602411657. The reversal of 640505602411565 is 565114206505046.

It is not a de Polignac number, because 640505602411565 - 2⁸ = 640505602411309 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37087750625 + ... + 37087767894.

It is an arithmetic number, because the mean of its divisors is an integer number (52738793667720).

Almost surely, 2^{640505602411565} is an apocalyptic number.

It is an amenable number.

640505602411565 is a deficient number, since it is larger than the sum of its proper divisors (203315096271955).

640505602411565 is a wasteful number, since it uses less digits than its factorization.

640505602411565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74175518692.

The product of its (nonzero) digits is 4320000, while the sum is 50.

The spelling of 640505602411565 in words is "six hundred forty trillion, five hundred five billion, six hundred two million, four hundred eleven thousand, five hundred sixty-five".