66880019 has 8 divisors (see below), whose sum is σ = 70596240. Its totient is φ = 63183456.

The previous prime is 66880001. The next prime is 66880031. The reversal of 66880019 is 91008866.

66880019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66880019 - 2⁸ = 66879763 is a prime.

It is a super-2 number, since 2×66880019² = 8945873882880722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66880039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2369 + ... + 11805.

It is an arithmetic number, because the mean of its divisors is an integer number (8824530).

Almost surely, 2^66880019 is an apocalyptic number.

66880019 is a deficient number, since it is larger than the sum of its proper divisors (3716221).

66880019 is a wasteful number, since it uses less digits than its factorization.

66880019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9829.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 66880019 is about 8178.0204817547. The cubic root of 66880019 is about 405.9122230909.

The spelling of 66880019 in words is "sixty-six million, eight hundred eighty thousand, nineteen".