66838140660 has 24 divisors (see below), whose sum is σ = 187146794016. Its totient is φ = 17823504160.

The previous prime is 66838140641. The next prime is 66838140713. The reversal of 66838140660 is 6604183866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556984446 + ... + 556984565.

It is an arithmetic number, because the mean of its divisors is an integer number (7797783084).

Almost surely, 2^66838140660 is an apocalyptic number.

66838140660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66838140660 is an abundant number, since it is smaller than the sum of its proper divisors (120308653356).

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

66838140660 is a wasteful number, since it uses less digits than its factorization.

66838140660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113969023 (or 1113969021 counting only the distinct ones).

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

The spelling of 66838140660 in words is "sixty-six billion, eight hundred thirty-eight million, one hundred forty thousand, six hundred sixty".