6620440266 has 48 divisors (see below), whose sum is σ = 16071258528. Its totient is φ = 1951970400.

The previous prime is 6620440249. The next prime is 6620440283.

6620440266 is a `hidden beast` number, since 6 + 620 + 4 + 4 + 0 + 26 + 6 = 666.

6620440266 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (6620440249) and next prime (6620440283).

It is a self number, because there is not a number n which added to its sum of digits gives 6620440266.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444520 + ... + 459171.

It is an arithmetic number, because the mean of its divisors is an integer number (334817886).

Almost surely, 2^6620440266 is an apocalyptic number.

6620440266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6620440266 is an abundant number, since it is smaller than the sum of its proper divisors (9450818262).

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

6620440266 is a wasteful number, since it uses less digits than its factorization.

6620440266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903747 (or 903744 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 6620440266 is about 81366.0879359454. The cubic root of 6620440266 is about 1877.7118935933.

The spelling of 6620440266 in words is "six billion, six hundred twenty million, four hundred forty thousand, two hundred sixty-six".