2265663616 has 64 divisors (see below), whose sum is σ = 4598959680. Its totient is φ = 1111610368.

The previous prime is 2265663611. The next prime is 2265663637. The reversal of 2265663616 is 6163665622.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (2265663611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1773570 + ... + 1774846.

It is an arithmetic number, because the mean of its divisors is an integer number (71858745).

Almost surely, 2^2265663616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2265663616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2299479840).

2265663616 is an abundant number, since it is smaller than the sum of its proper divisors (2333296064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2265663616 is a wasteful number, since it uses less digits than its factorization.

2265663616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541 (or 1529 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 2265663616 is about 47598.9875522579. The cubic root of 2265663616 is about 1313.4044300597.

The spelling of 2265663616 in words is "two billion, two hundred sixty-five million, six hundred sixty-three thousand, six hundred sixteen".