66315619 has 2 divisors, whose sum is σ = 66315620. Its totient is φ = 66315618.

The previous prime is 66315607. The next prime is 66315629. The reversal of 66315619 is 91651366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66315619 - 2¹⁵ = 66282851 is a prime.

It is a super-2 number, since 2×66315619² = 8795522646706322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66315629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33157809 + 33157810.

It is an arithmetic number, because the mean of its divisors is an integer number (33157810).

Almost surely, 2^66315619 is an apocalyptic number.

66315619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66315619 is an equidigital number, since it uses as much as digits as its factorization.

66315619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 66315619 is about 8143.4402435334. The cubic root of 66315619 is about 404.7671658698.

The spelling of 66315619 in words is "sixty-six million, three hundred fifteen thousand, six hundred nineteen".