66872419 has 4 divisors (see below), whose sum is σ = 70392040. Its totient is φ = 63352800.

The previous prime is 66872413. The next prime is 66872447. The reversal of 66872419 is 91427866.

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 66872419 - 2³ = 66872411 is a prime.

It is a super-2 number, since 2×66872419² = 8943840845823122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66872411) 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, 1759782 + ... + 1759819.

It is an arithmetic number, because the mean of its divisors is an integer number (17598010).

Almost surely, 2^66872419 is an apocalyptic number.

66872419 is a deficient number, since it is larger than the sum of its proper divisors (3519621).

66872419 is a wasteful number, since it uses less digits than its factorization.

66872419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519620.

The product of its digits is 145152, while the sum is 43.

The square root of 66872419 is about 8177.5558084308. Note that the first 3 decimals coincide. The cubic root of 66872419 is about 405.8968470499.

The spelling of 66872419 in words is "sixty-six million, eight hundred seventy-two thousand, four hundred nineteen".