2265221992 has 64 divisors (see below), whose sum is σ = 4776071040. Its totient is φ = 998150400.

The previous prime is 2265221947. The next prime is 2265222019. The reversal of 2265221992 is 2991225622.

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, 1011498 + ... + 1013734.

It is an arithmetic number, because the mean of its divisors is an integer number (74626110).

Almost surely, 2^2265221992 is an apocalyptic number.

2265221992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2265221992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2388035520).

2265221992 is an abundant number, since it is smaller than the sum of its proper divisors (2510849048).

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

2265221992 is a wasteful number, since it uses less digits than its factorization.

2265221992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602 (or 2598 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 2265221992 is about 47594.3483199424. The cubic root of 2265221992 is about 1313.3190880868.

It can be divided in two parts, 22652 and 21992, that added together give a palindrome (44644).

The spelling of 2265221992 in words is "two billion, two hundred sixty-five million, two hundred twenty-one thousand, nine hundred ninety-two".