666727671 has 16 divisors (see below), whose sum is σ = 905224320. Its totient is φ = 436378080.

The previous prime is 666727667. The next prime is 666727697. The reversal of 666727671 is 176727666.

It is not a de Polignac number, because 666727671 - 2² = 666727667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666727671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666727601) 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, 164556 + ... + 168558.

It is an arithmetic number, because the mean of its divisors is an integer number (56576520).

Almost surely, 2^666727671 is an apocalyptic number.

666727671 is a deficient number, since it is larger than the sum of its proper divisors (238496649).

666727671 is a wasteful number, since it uses less digits than its factorization.

666727671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5006.

The product of its digits is 889056, while the sum is 48.

The square root of 666727671 is about 25821.0702915274. The cubic root of 666727671 is about 873.6071100205.

The spelling of 666727671 in words is "six hundred sixty-six million, seven hundred twenty-seven thousand, six hundred seventy-one".