667145309 has 8 divisors (see below), whose sum is σ = 705411840. Its totient is φ = 629194176.

The previous prime is 667145279. The next prime is 667145329. The reversal of 667145309 is 903541766.

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

It is a cyclic number.

It is not a de Polignac number, because 667145309 - 2⁸ = 667145053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667145329) 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, 74492 + ... + 82965.

It is an arithmetic number, because the mean of its divisors is an integer number (88176480).

Almost surely, 2^667145309 is an apocalyptic number.

It is an amenable number.

667145309 is a deficient number, since it is larger than the sum of its proper divisors (38266531).

667145309 is a wasteful number, since it uses less digits than its factorization.

667145309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157699.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 667145309 is about 25829.1561805646. The cubic root of 667145309 is about 873.7894810183.

The spelling of 667145309 in words is "six hundred sixty-seven million, one hundred forty-five thousand, three hundred nine".