6642255312 has 360 divisors, whose sum is σ = 24228463168. Its totient is φ = 1724405760.

The previous prime is 6642255287. The next prime is 6642255349. The reversal of 6642255312 is 2135522466.

6642255312 is a `hidden beast` number, since 6 + 642 + 2 + 5 + 5 + 3 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3292128 + ... + 3294144.

Almost surely, 2^6642255312 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 6642255312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12114231584).

6642255312 is an abundant number, since it is smaller than the sum of its proper divisors (17586207856).

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

6642255312 is a wasteful number, since it uses less digits than its factorization.

6642255312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069 (or 2040 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 6642255312 is about 81500.0325889505. The cubic root of 6642255312 is about 1879.7720517349.

Adding to 6642255312 its reverse (2135522466), we get a palindrome (8777777778).

The spelling of 6642255312 in words is "six billion, six hundred forty-two million, two hundred fifty-five thousand, three hundred twelve".