6404620266 has 96 divisors (see below), whose sum is σ = 15830208576. Its totient is φ = 1940598000.

The previous prime is 6404620231. The next prime is 6404620267. The reversal of 6404620266 is 6620264046.

6404620266 is a `hidden beast` number, since 6 + 4 + 0 + 4 + 620 + 26 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6404620266.

It is not an unprimeable number, because it can be changed into a prime (6404620267) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 641916 + ... + 651816.

It is an arithmetic number, because the mean of its divisors is an integer number (164898006).

Almost surely, 2^6404620266 is an apocalyptic number.

6404620266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6404620266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7915104288).

6404620266 is an abundant number, since it is smaller than the sum of its proper divisors (9425588310).

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

6404620266 is an equidigital number, since it uses as much as digits as its factorization.

6404620266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9951 (or 9917 counting only the distinct ones).

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

The square root of 6404620266 is about 80028.8714527451. The cubic root of 6404620266 is about 1857.0822046233.

The spelling of 6404620266 in words is "six billion, four hundred four million, six hundred twenty thousand, two hundred sixty-six".