666665710 has 32 divisors (see below), whose sum is σ = 1275613920. Its totient is φ = 249987072.

The previous prime is 666665689. The next prime is 666665723. The reversal of 666665710 is 17566666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36061 + ... + 51319.

It is an arithmetic number, because the mean of its divisors is an integer number (39862935).

Almost surely, 2^666665710 is an apocalyptic number.

666665710 is a deficient number, since it is larger than the sum of its proper divisors (608948210).

666665710 is a wasteful number, since it uses less digits than its factorization.

666665710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15540.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 666665710 is about 25819.8704489391. The cubic root of 666665710 is about 873.5800468734.

The spelling of 666665710 in words is "six hundred sixty-six million, six hundred sixty-five thousand, seven hundred ten".