66504919 has 8 divisors (see below), whose sum is σ = 72630432. Its totient is φ = 60523680.

The previous prime is 66504913. The next prime is 66504943. The reversal of 66504919 is 91940566.

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 66504919 - 2¹⁷ = 66373847 is a prime.

It is a super-2 number, since 2×66504919² = 8845808502393122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66504913) 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 7 ways as a sum of consecutive naturals, for example, 35104 + ... + 36949.

It is an arithmetic number, because the mean of its divisors is an integer number (9078804).

Almost surely, 2^66504919 is an apocalyptic number.

66504919 is a deficient number, since it is larger than the sum of its proper divisors (6125513).

66504919 is a wasteful number, since it uses less digits than its factorization.

66504919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72137.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 66504919 is about 8155.0548128140. The cubic root of 66504919 is about 405.1519401458.

The spelling of 66504919 in words is "sixty-six million, five hundred four thousand, nine hundred nineteen".