6640265212 has 96 divisors (see below), whose sum is σ = 14517619200. Its totient is φ = 2592995328.

The previous prime is 6640265147. The next prime is 6640265221. The reversal of 6640265212 is 2125620466.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent 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, 1879864 + ... + 1883392.

It is an arithmetic number, because the mean of its divisors is an integer number (151225200).

Almost surely, 2^6640265212 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 6640265212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7258809600).

6640265212 is an abundant number, since it is smaller than the sum of its proper divisors (7877353988).

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

6640265212 is a wasteful number, since it uses less digits than its factorization.

6640265212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683 (or 3681 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 6640265212 is about 81487.8224767357. The cubic root of 6640265212 is about 1879.5842988379.

Adding to 6640265212 its reverse (2125620466), we get a palindrome (8765885678).

The spelling of 6640265212 in words is "six billion, six hundred forty million, two hundred sixty-five thousand, two hundred twelve".