2565501663 has 8 divisors (see below), whose sum is σ = 3421686528. Its totient is φ = 1709825624.

The previous prime is 2565501643. The next prime is 2565501667. The reversal of 2565501663 is 3661055652.

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

It is a cyclic number.

It is not a de Polignac number, because 2565501663 - 2⁶ = 2565501599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565501667) 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, 115281 + ... + 135722.

It is an arithmetic number, because the mean of its divisors is an integer number (427710816).

Almost surely, 2^2565501663 is an apocalyptic number.

2565501663 is a deficient number, since it is larger than the sum of its proper divisors (856184865).

2565501663 is a wasteful number, since it uses less digits than its factorization.

2565501663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254413.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 2565501663 is about 50650.7814648501. The cubic root of 2565501663 is about 1368.9600261019.

The spelling of 2565501663 in words is "two billion, five hundred sixty-five million, five hundred one thousand, six hundred sixty-three".