66920941 has 2 divisors, whose sum is σ = 66920942. Its totient is φ = 66920940.

The previous prime is 66920933. The next prime is 66920963. The reversal of 66920941 is 14902966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33524100 + 33396841 = 5790^2 + 5779^2 .

It is a cyclic number.

It is not a de Polignac number, because 66920941 - 2³ = 66920933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66920941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66920911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33460470 + 33460471.

It is an arithmetic number, because the mean of its divisors is an integer number (33460471).

Almost surely, 2^66920941 is an apocalyptic number.

It is an amenable number.

66920941 is a deficient number, since it is larger than the sum of its proper divisors (1).

66920941 is an equidigital number, since it uses as much as digits as its factorization.

66920941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 66920941 is about 8180.5220493560. The cubic root of 66920941 is about 405.9949949637.

The spelling of 66920941 in words is "sixty-six million, nine hundred twenty thousand, nine hundred forty-one".