2666620520 has 16 divisors (see below), whose sum is σ = 5999896260. Its totient is φ = 1066648192.

The previous prime is 2666620519. The next prime is 2666620549. The reversal of 2666620520 is 250266662.

It can be written as a sum of positive squares in 2 ways, for example, as 2666069956 + 550564 = 51634^2 + 742^2 .

It is a super-3 number, since 3×2666620520³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33332717 + ... + 33332796.

Almost surely, 2^2666620520 is an apocalyptic number.

2666620520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2666620520 is an abundant number, since it is smaller than the sum of its proper divisors (3333275740).

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

2666620520 is a wasteful number, since it uses less digits than its factorization.

2666620520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66665524 (or 66665520 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 2666620520 is about 51639.3311343205. The cubic root of 2666620520 is about 1386.7145495772.

The spelling of 2666620520 in words is "two billion, six hundred sixty-six million, six hundred twenty thousand, five hundred twenty".