666656067 has 32 divisors (see below), whose sum is σ = 1119006720. Its totient is φ = 342940320.

The previous prime is 666656057. The next prime is 666656113. The reversal of 666656067 is 760656666.

It is not a de Polignac number, because 666656067 - 2⁴ = 666656051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666656027) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 9784 + ... + 37802.

It is an arithmetic number, because the mean of its divisors is an integer number (34968960).

Almost surely, 2^666656067 is an apocalyptic number.

666656067 is a deficient number, since it is larger than the sum of its proper divisors (452350653).

666656067 is a wasteful number, since it uses less digits than its factorization.

666656067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28143.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The square root of 666656067 is about 25819.6837122378. The cubic root of 666656067 is about 873.5758348809.

The spelling of 666656067 in words is "six hundred sixty-six million, six hundred fifty-six thousand, sixty-seven".