66705811700 has 54 divisors (see below), whose sum is σ = 159107171958. Its totient is φ = 24256654400.

The previous prime is 66705811693. The next prime is 66705811727. The reversal of 66705811700 is 711850766.

It can be written as a sum of positive squares in 3 ways, for example, as 11230488676 + 55475323024 = 105974^2 + 235532^2 .

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 17 ways as a sum of consecutive naturals, for example, 2744339 + ... + 2768538.

Almost surely, 2^66705811700 is an apocalyptic number.

It is an amenable number.

66705811700 is an abundant number, since it is smaller than the sum of its proper divisors (92401360258).

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

66705811700 is a wasteful number, since it uses less digits than its factorization.

66705811700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512913 (or 5512895 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 66705811700 in words is "sixty-six billion, seven hundred five million, eight hundred eleven thousand, seven hundred".