6651885421440 has 2048 divisors, whose sum is σ = 28934889984000. Its totient is φ = 1429689139200.

The previous prime is 6651885421439. The next prime is 6651885421453. The reversal of 6651885421440 is 441245881566.

6651885421440 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 88 + 542 + 14 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 11649536355 + ... + 11649536925.

It is an arithmetic number, because the mean of its divisors is an integer number (14128364250).

Almost surely, 2^{6651885421440} is an apocalyptic number.

6651885421440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6651885421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14467444992000).

6651885421440 is an abundant number, since it is smaller than the sum of its proper divisors (22283004562560).

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

6651885421440 is an equidigital number, since it uses as much as digits as its factorization.

6651885421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 54.

The spelling of 6651885421440 in words is "six trillion, six hundred fifty-one billion, eight hundred eighty-five million, four hundred twenty-one thousand, four hundred forty".