66419 has 4 divisors (see below), whose sum is σ = 70344. Its totient is φ = 62496.

The previous prime is 66413. The next prime is 66431. The reversal of 66419 is 91466.

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 66419 - 2⁴ = 66403 is a prime.

It is a super-2 number, since 2×66419² = 8822967122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66413) 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, 1937 + ... + 1970.

It is an arithmetic number, because the mean of its divisors is an integer number (17586).

2⁶⁶⁴¹⁹ is an apocalyptic number.

66419 is a deficient number, since it is larger than the sum of its proper divisors (3925).

66419 is a wasteful number, since it uses less digits than its factorization.

66419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3924.

The product of its digits is 1296, while the sum is 26.

The square root of 66419 is about 257.7188390475. The cubic root of 66419 is about 40.4977390396.

The spelling of 66419 in words is "sixty-six thousand, four hundred nineteen".