666871178666 has 32 divisors (see below), whose sum is σ = 1276138879488. Its totient is φ = 253777613040.

The previous prime is 666871178663. The next prime is 666871178707.

666871178666 is nontrivially palindromic in base 10.

666871178666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 666871178596 and 666871178605.

It is not an unprimeable number, because it can be changed into a prime (666871178663) 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, 50346080 + ... + 50359323.

It is an arithmetic number, because the mean of its divisors is an integer number (39879339984).

Almost surely, 2^666871178666 is an apocalyptic number.

666871178666 is a deficient number, since it is larger than the sum of its proper divisors (609267700822).

666871178666 is a wasteful number, since it uses less digits than its factorization.

666871178666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100705466.

The product of its digits is 146313216, while the sum is 68.

The spelling of 666871178666 in words is "six hundred sixty-six billion, eight hundred seventy-one million, one hundred seventy-eight thousand, six hundred sixty-six".