66610066812 has 48 divisors (see below), whose sum is σ = 161204669472. Its totient is φ = 21389356800.

The previous prime is 66610066799. The next prime is 66610066819. The reversal of 66610066812 is 21866001666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66610066819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 697843 + ... + 787530.

It is an arithmetic number, because the mean of its divisors is an integer number (3358430614).

Almost surely, 2^66610066812 is an apocalyptic number.

It is an amenable number.

66610066812 is an abundant number, since it is smaller than the sum of its proper divisors (94594602660).

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

66610066812 is a wasteful number, since it uses less digits than its factorization.

66610066812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485518 (or 1485516 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 66610066812 in words is "sixty-six billion, six hundred ten million, sixty-six thousand, eight hundred twelve".