6657487421056 has 128 divisors (see below), whose sum is σ = 13462010265600. Its totient is φ = 3279178226688.

The previous prime is 6657487421047. The next prime is 6657487421107. The reversal of 6657487421056 is 6501247847566.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 6657487420985 and 6657487421003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4003298881 + ... + 4003300543.

It is an arithmetic number, because the mean of its divisors is an integer number (105171955200).

Almost surely, 2^{6657487421056} 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 6657487421056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6731005132800).

6657487421056 is an abundant number, since it is smaller than the sum of its proper divisors (6804522844544).

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

6657487421056 is a wasteful number, since it uses less digits than its factorization.

6657487421056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3246 (or 3234 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 61.

The spelling of 6657487421056 in words is "six trillion, six hundred fifty-seven billion, four hundred eighty-seven million, four hundred twenty-one thousand, fifty-six".