666739670 has 8 divisors (see below), whose sum is σ = 1200131424. Its totient is φ = 266695864.

The previous prime is 666739669. The next prime is 666739691. The reversal of 666739670 is 76937666.

666739670 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 33336974 + ... + 33336993.

It is an arithmetic number, because the mean of its divisors is an integer number (150016428).

Almost surely, 2^666739670 is an apocalyptic number.

666739670 is a deficient number, since it is larger than the sum of its proper divisors (533391754).

666739670 is a wasteful number, since it uses less digits than its factorization.

666739670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66673974.

The product of its (nonzero) digits is 1714608, while the sum is 50.

The square root of 666739670 is about 25821.3026394874. The cubic root of 666739670 is about 873.6123507154.

The spelling of 666739670 in words is "six hundred sixty-six million, seven hundred thirty-nine thousand, six hundred seventy".