66316819 has 2 divisors, whose sum is σ = 66316820. Its totient is φ = 66316818.

The previous prime is 66316759. The next prime is 66316829. The reversal of 66316819 is 91861366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66316819 - 2¹¹ = 66314771 is a prime.

It is a super-2 number, since 2×66316819² = 8795840964557522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66316829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33158409 + 33158410.

It is an arithmetic number, because the mean of its divisors is an integer number (33158410).

Almost surely, 2^66316819 is an apocalyptic number.

66316819 is a deficient number, since it is larger than the sum of its proper divisors (1).

66316819 is an equidigital number, since it uses as much as digits as its factorization.

66316819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 66316819 is about 8143.5139221346. The cubic root of 66316819 is about 404.7696073141.

The spelling of 66316819 in words is "sixty-six million, three hundred sixteen thousand, eight hundred nineteen".