66671611 has 2 divisors, whose sum is σ = 66671612. Its totient is φ = 66671610.

The previous prime is 66671599. The next prime is 66671621. The reversal of 66671611 is 11617666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66671611 - 2²³ = 58283003 is a prime.

It is not a weakly prime, because it can be changed into another prime (66671621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335805 + 33335806.

It is an arithmetic number, because the mean of its divisors is an integer number (33335806).

Almost surely, 2^66671611 is an apocalyptic number.

66671611 is a deficient number, since it is larger than the sum of its proper divisors (1).

66671611 is an equidigital number, since it uses as much as digits as its factorization.

66671611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 66671611 is about 8165.2685810082. The cubic root of 66671611 is about 405.4901569351.

The spelling of 66671611 in words is "sixty-six million, six hundred seventy-one thousand, six hundred eleven".