2563005665 has 24 divisors (see below), whose sum is σ = 3558569280. Its totient is φ = 1765890720.

The previous prime is 2563005661. The next prime is 2563005671. The reversal of 2563005665 is 5665003652.

It is not a de Polignac number, because 2563005665 - 2² = 2563005661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2563005661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99989 + ... + 122978.

It is an arithmetic number, because the mean of its divisors is an integer number (148273720).

Almost surely, 2^2563005665 is an apocalyptic number.

It is an amenable number.

2563005665 is a deficient number, since it is larger than the sum of its proper divisors (995563615).

2563005665 is a wasteful number, since it uses less digits than its factorization.

2563005665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223013 (or 223002 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

The square root of 2563005665 is about 50626.1361847811. The cubic root of 2563005665 is about 1368.5159244988.

The spelling of 2563005665 in words is "two billion, five hundred sixty-three million, five thousand, six hundred sixty-five".