666681754828110 has 128 divisors (see below), whose sum is σ = 1838960008704000. Its totient is φ = 151522358607360.

The previous prime is 666681754828097. The next prime is 666681754828147. The reversal of 666681754828110 is 11828457186666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 285775771 + ... + 288099209.

It is an arithmetic number, because the mean of its divisors is an integer number (14366875068000).

Almost surely, 2^{666681754828110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666681754828110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919480004352000).

666681754828110 is an abundant number, since it is smaller than the sum of its proper divisors (1172278253875890).

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

666681754828110 is a wasteful number, since it uses less digits than its factorization.

666681754828110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331186.

The product of its (nonzero) digits is 185794560, while the sum is 69.

The spelling of 666681754828110 in words is "six hundred sixty-six trillion, six hundred eighty-one billion, seven hundred fifty-four million, eight hundred twenty-eight thousand, one hundred ten".