666808026 has 8 divisors (see below), whose sum is σ = 1333616064. Its totient is φ = 222269340.

The previous prime is 666808003. The next prime is 666808081. The reversal of 666808026 is 620808666.

It is a sphenic number, since it is the product of 3 distinct primes.

666808026 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55567330 + ... + 55567341.

It is an arithmetic number, because the mean of its divisors is an integer number (166702008).

Almost surely, 2^666808026 is an apocalyptic number.

666808026 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

666808026 is a wasteful number, since it uses less digits than its factorization.

666808026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111134676.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 666808026 is about 25822.6262413411. The cubic root of 666808026 is about 873.6422047488.

The spelling of 666808026 in words is "six hundred sixty-six million, eight hundred eight thousand, twenty-six".