66666793 has 2 divisors, whose sum is σ = 66666794. Its totient is φ = 66666792.

The previous prime is 66666781. The next prime is 66666827. The reversal of 66666793 is 39766666.

It is a happy number.

66666793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64208169 + 2458624 = 8013^2 + 1568^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666793 - 2¹³ = 66658601 is a prime.

It is a super-2 number, since 2×66666793² = 8888922577809698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66666713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333396 + 33333397.

It is an arithmetic number, because the mean of its divisors is an integer number (33333397).

Almost surely, 2^66666793 is an apocalyptic number.

It is an amenable number.

66666793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666793 is an equidigital number, since it uses as much as digits as its factorization.

66666793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 49.

The square root of 66666793 is about 8164.9735455787. The cubic root of 66666793 is about 405.4803891663.

The spelling of 66666793 in words is "sixty-six million, six hundred sixty-six thousand, seven hundred ninety-three".