66955393 has 2 divisors, whose sum is σ = 66955394. Its totient is φ = 66955392.

The previous prime is 66955391. The next prime is 66955417. The reversal of 66955393 is 39355966.

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., 51955264 + 15000129 = 7208^2 + 3873^2 .

It is a cyclic number.

It is not a de Polignac number, because 66955393 - 2¹ = 66955391 is a prime.

Together with 66955391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66955391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33477696 + 33477697.

It is an arithmetic number, because the mean of its divisors is an integer number (33477697).

Almost surely, 2^66955393 is an apocalyptic number.

It is an amenable number.

66955393 is a deficient number, since it is larger than the sum of its proper divisors (1).

66955393 is an equidigital number, since it uses as much as digits as its factorization.

66955393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 656100, while the sum is 46.

The square root of 66955393 is about 8182.6275119915. The cubic root of 66955393 is about 406.0646539759.

The spelling of 66955393 in words is "sixty-six million, nine hundred fifty-five thousand, three hundred ninety-three".