66712939 has 2 divisors, whose sum is σ = 66712940. Its totient is φ = 66712938.

The previous prime is 66712937. The next prime is 66712969. The reversal of 66712939 is 93921766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66712939 - 2¹ = 66712937 is a prime.

Together with 66712937, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 66712895 and 66712904.

It is not a weakly prime, because it can be changed into another prime (66712931) 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, 33356469 + 33356470.

It is an arithmetic number, because the mean of its divisors is an integer number (33356470).

Almost surely, 2^66712939 is an apocalyptic number.

66712939 is a deficient number, since it is larger than the sum of its proper divisors (1).

66712939 is an equidigital number, since it uses as much as digits as its factorization.

66712939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 66712939 is about 8167.7989079066. The cubic root of 66712939 is about 405.5739239013.

The spelling of 66712939 in words is "sixty-six million, seven hundred twelve thousand, nine hundred thirty-nine".