666878023876 has 27 divisors (see below), whose sum is σ = 1172933954703. Its totient is φ = 331762478760.

The previous prime is 666878023871. The next prime is 666878023907. The reversal of 666878023876 is 678320878666.

The square root of 666878023876 is 816626.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666878023871) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 364214281 + ... + 364216111.

Almost surely, 2^666878023876 is an apocalyptic number.

666878023876 is the 816626-th square number.

It is an amenable number.

666878023876 is a deficient number, since it is larger than the sum of its proper divisors (506055930827).

666878023876 is an frugal number, since it uses more digits than its factorization.

666878023876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112 (or 2056 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 67.

The spelling of 666878023876 in words is "six hundred sixty-six billion, eight hundred seventy-eight million, twenty-three thousand, eight hundred seventy-six".