666667407 has 8 divisors (see below), whose sum is σ = 1015874176. Its totient is φ = 380952792.

The previous prime is 666667403. The next prime is 666667433. The reversal of 666667407 is 704766666.

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

It is not a de Polignac number, because 666667407 - 2² = 666667403 is a prime.

It is a super-2 number, since 2×666667407² = 888890863112207298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666667403) 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 7 ways as a sum of consecutive naturals, for example, 15873013 + ... + 15873054.

It is an arithmetic number, because the mean of its divisors is an integer number (126984272).

Almost surely, 2^666667407 is an apocalyptic number.

666667407 is a deficient number, since it is larger than the sum of its proper divisors (349206769).

666667407 is a wasteful number, since it uses less digits than its factorization.

666667407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31746077.

The product of its (nonzero) digits is 1524096, while the sum is 48.

The square root of 666667407 is about 25819.9033112055. The cubic root of 666667407 is about 873.5807881065.

The spelling of 666667407 in words is "six hundred sixty-six million, six hundred sixty-seven thousand, four hundred seven".