66000019 has 8 divisors (see below), whose sum is σ = 66699072. Its totient is φ = 65304960.

The previous prime is 66000013. The next prime is 66000029. The reversal of 66000019 is 91000066.

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 66000019 - 2¹⁹ = 65475731 is a prime.

It is a super-2 number, since 2×66000019² = 8712005016000722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66000013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40902 + ... + 42484.

It is an arithmetic number, because the mean of its divisors is an integer number (8337384).

Almost surely, 2^66000019 is an apocalyptic number.

66000019 is a deficient number, since it is larger than the sum of its proper divisors (699053).

66000019 is a wasteful number, since it uses less digits than its factorization.

66000019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 66000019 is about 8124.0395740050. The cubic root of 66000019 is about 404.1240408418.

The spelling of 66000019 in words is "sixty-six million, nineteen", and thus it is an aban number and an uban number.