66661883 has 2 divisors, whose sum is σ = 66661884. Its totient is φ = 66661882.

The previous prime is 66661867. The next prime is 66661897. The reversal of 66661883 is 38816666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66661883 - 2⁴ = 66661867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66661813) 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, 33330941 + 33330942.

It is an arithmetic number, because the mean of its divisors is an integer number (33330942).

Almost surely, 2^66661883 is an apocalyptic number.

66661883 is a deficient number, since it is larger than the sum of its proper divisors (1).

66661883 is an equidigital number, since it uses as much as digits as its factorization.

66661883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 66661883 is about 8164.6728654613. The cubic root of 66661883 is about 405.4704343973.

The spelling of 66661883 in words is "sixty-six million, six hundred sixty-one thousand, eight hundred eighty-three".