6620266064 has 80 divisors (see below), whose sum is σ = 14027852160. Its totient is φ = 3015936000.

The previous prime is 6620266057. The next prime is 6620266069. The reversal of 6620266064 is 4606620266.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620266069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 881204 + ... + 888684.

It is an arithmetic number, because the mean of its divisors is an integer number (175348152).

Almost surely, 2^6620266064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6620266064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7013926080).

6620266064 is an abundant number, since it is smaller than the sum of its proper divisors (7407586096).

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

6620266064 is a wasteful number, since it uses less digits than its factorization.

6620266064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7620 (or 7614 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 6620266064 is about 81365.0174460745. The cubic root of 6620266064 is about 1877.6954241934.

The spelling of 6620266064 in words is "six billion, six hundred twenty million, two hundred sixty-six thousand, sixty-four".