66615706206 has 40 divisors (see below), whose sum is σ = 170592605040. Its totient is φ = 19033058592.

The previous prime is 66615706163. The next prime is 66615706207. The reversal of 66615706206 is 60260751666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66615706207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29370871 + ... + 29373138.

It is an arithmetic number, because the mean of its divisors is an integer number (4264815126).

Almost surely, 2^66615706206 is an apocalyptic number.

66615706206 is an abundant number, since it is smaller than the sum of its proper divisors (103976898834).

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

66615706206 is a wasteful number, since it uses less digits than its factorization.

66615706206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58744030 (or 58744021 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 66615706206 in words is "sixty-six billion, six hundred fifteen million, seven hundred six thousand, two hundred six".