666708419 has 16 divisors (see below), whose sum is σ = 727742400. Its totient is φ = 607118976.

The previous prime is 666708403. The next prime is 666708433. The reversal of 666708419 is 914807666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 666708419 - 2⁴ = 666708403 is a prime.

It is a super-2 number, since 2×666708419² = 889000231930959122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666708619) 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 15 ways as a sum of consecutive naturals, for example, 371777 + ... + 373565.

It is an arithmetic number, because the mean of its divisors is an integer number (45483900).

Almost surely, 2^666708419 is an apocalyptic number.

666708419 is a deficient number, since it is larger than the sum of its proper divisors (61033981).

666708419 is a wasteful number, since it uses less digits than its factorization.

666708419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 666708419 is about 25820.6974925156. The cubic root of 666708419 is about 873.5987013670.

The spelling of 666708419 in words is "six hundred sixty-six million, seven hundred eight thousand, four hundred nineteen".