66016019 has 4 divisors (see below), whose sum is σ = 68145600. Its totient is φ = 63886440.

The previous prime is 66016007. The next prime is 66016031. The reversal of 66016019 is 91061066.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66016007) and next prime (66016031).

It is a cyclic number.

It is not a de Polignac number, because 66016019 - 2¹⁶ = 65950483 is a prime.

It is a super-2 number, since 2×66016019² = 8716229529216722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66015982 and 66016000.

It is not an unprimeable number, because it can be changed into a prime (66016039) 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, 1064744 + ... + 1064805.

It is an arithmetic number, because the mean of its divisors is an integer number (17036400).

Almost surely, 2^66016019 is an apocalyptic number.

66016019 is a deficient number, since it is larger than the sum of its proper divisors (2129581).

66016019 is a wasteful number, since it uses less digits than its factorization.

66016019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129580.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 66016019 is about 8125.0242461177. The cubic root of 66016019 is about 404.1566946820.

The spelling of 66016019 in words is "sixty-six million, sixteen thousand, nineteen".