66688888998 has 64 divisors (see below), whose sum is σ = 138786048000. Its totient is φ = 21337647744.

The previous prime is 66688888997. The next prime is 66688889021. The reversal of 66688888998 is 89988888666.

It is a self number, because there is not a number n which added to its sum of digits gives 66688888998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66688888997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22923568 + ... + 22926476.

It is an arithmetic number, because the mean of its divisors is an integer number (2168532000).

Almost surely, 2^66688888998 is an apocalyptic number.

66688888998 is an abundant number, since it is smaller than the sum of its proper divisors (72097159002).

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

66688888998 is a wasteful number, since it uses less digits than its factorization.

66688888998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669.

The product of its digits is 4586471424, while the sum is 84.

The spelling of 66688888998 in words is "sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred ninety-eight".