66671039 has 2 divisors, whose sum is σ = 66671040. Its totient is φ = 66671038.

The previous prime is 66671021. The next prime is 66671041. The reversal of 66671039 is 93017666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66671039 - 2²⁰ = 65622463 is a prime.

Together with 66671041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66670993 and 66671011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66671639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335519 + 33335520.

It is an arithmetic number, because the mean of its divisors is an integer number (33335520).

Almost surely, 2^66671039 is an apocalyptic number.

66671039 is a deficient number, since it is larger than the sum of its proper divisors (1).

66671039 is an equidigital number, since it uses as much as digits as its factorization.

66671039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 66671039 is about 8165.2335545286. The cubic root of 66671039 is about 405.4889973160.

The spelling of 66671039 in words is "sixty-six million, six hundred seventy-one thousand, thirty-nine".