667209149 has 8 divisors (see below), whose sum is σ = 743639040. Its totient is φ = 594910656.

The previous prime is 667209143. The next prime is 667209161. The reversal of 667209149 is 941902766.

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 667209149 - 2¹⁶ = 667143613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667209143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032509 + ... + 1033154.

It is an arithmetic number, because the mean of its divisors is an integer number (92954880).

Almost surely, 2^667209149 is an apocalyptic number.

It is an amenable number.

667209149 is a deficient number, since it is larger than the sum of its proper divisors (76429891).

667209149 is a wasteful number, since it uses less digits than its factorization.

667209149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065699.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 667209149 is about 25830.3919637314. The cubic root of 667209149 is about 873.8173514789.

The spelling of 667209149 in words is "six hundred sixty-seven million, two hundred nine thousand, one hundred forty-nine".