6657278885712 has 640 divisors, whose sum is σ = 26212722278400. Its totient is φ = 1565509607424.

The previous prime is 6657278885701. The next prime is 6657278885713. The reversal of 6657278885712 is 2175888727566.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657278885713) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12435633 + ... + 12959919.

It is an arithmetic number, because the mean of its divisors is an integer number (40957378560).

Almost surely, 2^{6657278885712} 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 6657278885712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13106361139200).

6657278885712 is an abundant number, since it is smaller than the sum of its proper divisors (19555443392688).

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

6657278885712 is a wasteful number, since it uses less digits than its factorization.

6657278885712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524360 (or 524348 counting only the distinct ones).

The product of its digits is 632217600, while the sum is 72.

The spelling of 6657278885712 in words is "six trillion, six hundred fifty-seven billion, two hundred seventy-eight million, eight hundred eighty-five thousand, seven hundred twelve".