66013219 has 2 divisors, whose sum is σ = 66013220. Its totient is φ = 66013218.

The previous prime is 66013187. The next prime is 66013237. The reversal of 66013219 is 91231066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66013219 - 2⁵ = 66013187 is a prime.

It is a super-2 number, since 2×66013219² = 8715490165483922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66013819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33006609 + 33006610.

It is an arithmetic number, because the mean of its divisors is an integer number (33006610).

Almost surely, 2^66013219 is an apocalyptic number.

66013219 is a deficient number, since it is larger than the sum of its proper divisors (1).

66013219 is an equidigital number, since it uses as much as digits as its factorization.

66013219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 66013219 is about 8124.8519371125. The cubic root of 66013219 is about 404.1509806409.

The spelling of 66013219 in words is "sixty-six million, thirteen thousand, two hundred nineteen".