2666520220 has 144 divisors (see below), whose sum is σ = 7048012608. Its totient is φ = 839946240.

The previous prime is 2666520209. The next prime is 2666520253. The reversal of 2666520220 is 220256662.

It is a super-2 number, since 2×2666520220² = 14220660167337696800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3961804 + ... + 3962476.

It is an arithmetic number, because the mean of its divisors is an integer number (48944532).

Almost surely, 2^2666520220 is an apocalyptic number.

2666520220 is a gapful number since it is divisible by the number (20) 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 2666520220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3524006304).

2666520220 is an abundant number, since it is smaller than the sum of its proper divisors (4381492388).

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

2666520220 is a wasteful number, since it uses less digits than its factorization.

2666520220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2666520220 is about 51638.3599662112. The cubic root of 2666520220 is about 1386.6971631247.

Adding to 2666520220 its reverse (220256662), we get a palindrome (2886776882).

The spelling of 2666520220 in words is "two billion, six hundred sixty-six million, five hundred twenty thousand, two hundred twenty".