66980611166 has 16 divisors (see below), whose sum is σ = 116706265440. Its totient is φ = 28235386080.

The previous prime is 66980611157. The next prime is 66980611171. The reversal of 66980611166 is 66111608966.

66980611166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39214961 + ... + 39216668.

It is an arithmetic number, because the mean of its divisors is an integer number (7294141590).

Almost surely, 2^66980611166 is an apocalyptic number.

66980611166 is a deficient number, since it is larger than the sum of its proper divisors (49725654274).

66980611166 is a wasteful number, since it uses less digits than its factorization.

66980611166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78431699.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 66980611166 in words is "sixty-six billion, nine hundred eighty million, six hundred eleven thousand, one hundred sixty-six".