666788899998 has 16 divisors (see below), whose sum is σ = 1436160707856. Its totient is φ = 205165815360.

The previous prime is 666788899991. The next prime is 666788899999. The reversal of 666788899998 is 899998887666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666788899991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4274287743 + ... + 4274287898.

It is an arithmetic number, because the mean of its divisors is an integer number (89760044241).

Almost surely, 2^666788899998 is an apocalyptic number.

666788899998 is an abundant number, since it is smaller than the sum of its proper divisors (769371807858).

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

666788899998 is a wasteful number, since it uses less digits than its factorization.

666788899998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8548575659.

The product of its digits is 40633270272, while the sum is 93.

The spelling of 666788899998 in words is "six hundred sixty-six billion, seven hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-eight".