66880313 has 2 divisors, whose sum is σ = 66880314. Its totient is φ = 66880312.

The previous prime is 66880309. The next prime is 66880357. The reversal of 66880313 is 31308866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51724864 + 15155449 = 7192^2 + 3893^2 .

It is a cyclic number.

It is not a de Polignac number, because 66880313 - 2² = 66880309 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66880213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33440156 + 33440157.

It is an arithmetic number, because the mean of its divisors is an integer number (33440157).

Almost surely, 2^66880313 is an apocalyptic number.

It is an amenable number.

66880313 is a deficient number, since it is larger than the sum of its proper divisors (1).

66880313 is an equidigital number, since it uses as much as digits as its factorization.

66880313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 66880313 is about 8178.0384567450. The cubic root of 66880313 is about 405.9128178775.

The spelling of 66880313 in words is "sixty-six million, eight hundred eighty thousand, three hundred thirteen".