66657771206 has 16 divisors (see below), whose sum is σ = 107765037744. Its totient is φ = 30740239584.

The previous prime is 66657771161. The next prime is 66657771209. The reversal of 66657771206 is 60217775666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66657771209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1004120 + ... + 1068443.

It is an arithmetic number, because the mean of its divisors is an integer number (6735314859).

Almost surely, 2^66657771206 is an apocalyptic number.

66657771206 is a deficient number, since it is larger than the sum of its proper divisors (41107266538).

66657771206 is a wasteful number, since it uses less digits than its factorization.

66657771206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073815.

The product of its (nonzero) digits is 4445280, while the sum is 53.

The spelling of 66657771206 in words is "sixty-six billion, six hundred fifty-seven million, seven hundred seventy-one thousand, two hundred six".