6626665266 has 64 divisors (see below), whose sum is σ = 14642546688. Its totient is φ = 1986550848.

The previous prime is 6626665259. The next prime is 6626665343. The reversal of 6626665266 is 6625666266.

It is a super-2 number, since 2×6626665266² = 87825385095221701512, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 828201 + ... + 836163.

It is an arithmetic number, because the mean of its divisors is an integer number (228789792).

Almost surely, 2^6626665266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6626665266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7321273344).

6626665266 is an abundant number, since it is smaller than the sum of its proper divisors (8015881422).

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

6626665266 is a wasteful number, since it uses less digits than its factorization.

6626665266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8255.

The product of its digits is 5598720, while the sum is 51.

The square root of 6626665266 is about 81404.3319854662. The cubic root of 6626665266 is about 1878.3002278255.

The spelling of 6626665266 in words is "six billion, six hundred twenty-six million, six hundred sixty-five thousand, two hundred sixty-six".