6656420321232 has 480 divisors, whose sum is σ = 20286854058240. Its totient is φ = 1874617958400.

The previous prime is 6656420321227. The next prime is 6656420321237. The reversal of 6656420321232 is 2321230246566.

It is an interprime number because it is at equal distance from previous prime (6656420321227) and next prime (6656420321237).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656420321237) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1407572244 + ... + 1407576972.

It is an arithmetic number, because the mean of its divisors is an integer number (42264279288).

Almost surely, 2^{6656420321232} 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 6656420321232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10143427029120).

6656420321232 is an abundant number, since it is smaller than the sum of its proper divisors (13630433737008).

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

6656420321232 is a wasteful number, since it uses less digits than its factorization.

6656420321232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083 (or 5066 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

Adding to 6656420321232 its reverse (2321230246566), we get a palindrome (8977650567798).

The spelling of 6656420321232 in words is "six trillion, six hundred fifty-six billion, four hundred twenty million, three hundred twenty-one thousand, two hundred thirty-two".