666026688 has 28 divisors (see below), whose sum is σ = 1762196120. Its totient is φ = 222008832.

The previous prime is 666026687. The next prime is 666026717. The reversal of 666026688 is 886620666.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (666026687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1734253 + ... + 1734636.

Almost surely, 2^666026688 is an apocalyptic number.

It is an amenable number.

666026688 is an abundant number, since it is smaller than the sum of its proper divisors (1096169432).

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

666026688 is a wasteful number, since it uses less digits than its factorization.

666026688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468904 (or 3468894 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 666026688 is about 25807.4928654451. The cubic root of 666026688 is about 873.3008388094.

The spelling of 666026688 in words is "six hundred sixty-six million, twenty-six thousand, six hundred eighty-eight".