666771005 has 16 divisors (see below), whose sum is σ = 821487744. Its totient is φ = 519330240.

The previous prime is 666770983. The next prime is 666771019. The reversal of 666771005 is 500177666.

It is not a de Polignac number, because 666771005 - 2⁶ = 666770941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666771005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25112 + ... + 44318.

It is an arithmetic number, because the mean of its divisors is an integer number (51342984).

Almost surely, 2^666771005 is an apocalyptic number.

It is an amenable number.

666771005 is a deficient number, since it is larger than the sum of its proper divisors (154716739).

666771005 is a wasteful number, since it uses less digits than its factorization.

666771005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19396.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 666771005 is about 25821.9093988032. The cubic root of 666771005 is about 873.6260363238.

The spelling of 666771005 in words is "six hundred sixty-six million, seven hundred seventy-one thousand, five".