66042419 has 2 divisors, whose sum is σ = 66042420. Its totient is φ = 66042418.

The previous prime is 66042401. The next prime is 66042421. The reversal of 66042419 is 91424066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66042419 is a prime.

It is a super-2 number, since 2×66042419² = 8723202214743122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 66042421, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66042469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33021209 + 33021210.

It is an arithmetic number, because the mean of its divisors is an integer number (33021210).

Almost surely, 2^66042419 is an apocalyptic number.

66042419 is a deficient number, since it is larger than the sum of its proper divisors (1).

66042419 is an equidigital number, since it uses as much as digits as its factorization.

66042419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66042419 is about 8126.6486942651. The cubic root of 66042419 is about 404.2105619854.

The spelling of 66042419 in words is "sixty-six million, forty-two thousand, four hundred nineteen".