66671081 has 2 divisors, whose sum is σ = 66671082. Its totient is φ = 66671080.

The previous prime is 66671053. The next prime is 66671083. The reversal of 66671081 is 18017666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53421481 + 13249600 = 7309^2 + 3640^2 .

It is a cyclic number.

It is not a de Polignac number, because 66671081 - 2¹⁴ = 66654697 is a prime.

It is a super-2 number, since 2×66671081² = 8890066083417122, which contains 22 as substring.

Together with 66671083, 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 (66671083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335540 + 33335541.

It is an arithmetic number, because the mean of its divisors is an integer number (33335541).

Almost surely, 2^66671081 is an apocalyptic number.

It is an amenable number.

66671081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66671081 is an equidigital number, since it uses as much as digits as its factorization.

66671081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 66671081 is about 8165.2361264081. The cubic root of 66671081 is about 405.4890824630.

It can be divided in two parts, 6667 and 1081, that multiplied together give a palindrome (7207027).

The spelling of 66671081 in words is "sixty-six million, six hundred seventy-one thousand, eighty-one".