2563768665 has 80 divisors (see below), whose sum is σ = 4873144320. Its totient is φ = 1287239040.

The previous prime is 2563768651. The next prime is 2563768673. The reversal of 2563768665 is 5668673652.

It is a happy number.

2563768665 is a `hidden beast` number, since 2 + 563 + 76 + 8 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 2563768665 - 2⁵ = 2563768633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 461776 + ... + 467294.

It is an arithmetic number, because the mean of its divisors is an integer number (60914304).

Almost surely, 2^2563768665 is an apocalyptic number.

It is an amenable number.

2563768665 is a deficient number, since it is larger than the sum of its proper divisors (2309375655).

2563768665 is a wasteful number, since it uses less digits than its factorization.

2563768665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5604 (or 5595 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The square root of 2563768665 is about 50633.6712573758. The cubic root of 2563768665 is about 1368.6517122142.

The spelling of 2563768665 in words is "two billion, five hundred sixty-three million, seven hundred sixty-eight thousand, six hundred sixty-five".