66449419 has 4 divisors (see below), whose sum is σ = 66466600. Its totient is φ = 66432240.

The previous prime is 66449401. The next prime is 66449431. The reversal of 66449419 is 91494466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66449419 - 2⁷ = 66449291 is a prime.

It is a super-2 number, since 2×66449419² = 8831050570875122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66489419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232 + ... + 11530.

It is an arithmetic number, because the mean of its divisors is an integer number (16616650).

Almost surely, 2^66449419 is an apocalyptic number.

66449419 is a deficient number, since it is larger than the sum of its proper divisors (17181).

66449419 is a wasteful number, since it uses less digits than its factorization.

66449419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17180.

The product of its digits is 186624, while the sum is 43.

The square root of 66449419 is about 8151.6513051038. The cubic root of 66449419 is about 405.0392056747.

The spelling of 66449419 in words is "sixty-six million, four hundred forty-nine thousand, four hundred nineteen".