2661320320 has 32 divisors (see below), whose sum is σ = 6362220420. Its totient is φ = 1064527872.

The previous prime is 2661320297. The next prime is 2661320351. The reversal of 2661320320 is 230231662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2660083776 + 1236544 = 51576^2 + 1112^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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 3 ways as a sum of consecutive naturals, for example, 2078517 + ... + 2079796.

Almost surely, 2^2661320320 is an apocalyptic number.

2661320320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661320320 is an abundant number, since it is smaller than the sum of its proper divisors (3700900100).

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

2661320320 is an equidigital number, since it uses as much as digits as its factorization.

2661320320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4158332 (or 4158320 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 2661320320 is about 51587.9861983389. The cubic root of 2661320320 is about 1385.7951912436.

Adding to 2661320320 its reverse (230231662), we get a palindrome (2891551982).

The spelling of 2661320320 in words is "two billion, six hundred sixty-one million, three hundred twenty thousand, three hundred twenty".