166666511077 has 16 divisors (see below), whose sum is σ = 188221017600. Its totient is φ = 146207188800.

The previous prime is 166666511047. The next prime is 166666511129. The reversal of 166666511077 is 770115666661.

It is a cyclic number.

It is not a de Polignac number, because 166666511077 - 2²⁷ = 166532293349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666511017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 581218 + ... + 819235.

It is an arithmetic number, because the mean of its divisors is an integer number (11763813600).

Almost surely, 2^166666511077 is an apocalyptic number.

It is an amenable number.

166666511077 is a deficient number, since it is larger than the sum of its proper divisors (21554506523).

166666511077 is a wasteful number, since it uses less digits than its factorization.

166666511077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400844.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 166666511077 in words is "one hundred sixty-six billion, six hundred sixty-six million, five hundred eleven thousand, seventy-seven".