6688221475554 has 64 divisors (see below), whose sum is σ = 14979605544960. Its totient is φ = 2211909930000.

The previous prime is 6688221475531. The next prime is 6688221475601. The reversal of 6688221475554 is 4555741228866.

It is a happy number.

6688221475554 is a `hidden beast` number, since 6 + 6 + 8 + 8 + 2 + 2 + 1 + 4 + 75 + 554 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 6688221475491 and 6688221475500.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6107199 + ... + 7118589.

It is an arithmetic number, because the mean of its divisors is an integer number (234056336640).

Almost surely, 2^{6688221475554} is an apocalyptic number.

6688221475554 is an abundant number, since it is smaller than the sum of its proper divisors (8291384069406).

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

6688221475554 is a wasteful number, since it uses less digits than its factorization.

6688221475554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012364 (or 1012358 counting only the distinct ones).

The product of its digits is 129024000, while the sum is 63.

The spelling of 6688221475554 in words is "six trillion, six hundred eighty-eight billion, two hundred twenty-one million, four hundred seventy-five thousand, five hundred fifty-four".