66091793 has 2 divisors, whose sum is σ = 66091794. Its totient is φ = 66091792.

The previous prime is 66091787. The next prime is 66091799. The reversal of 66091793 is 39719066.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (66091787) and next prime (66091799).

It can be written as a sum of positive squares in only one way, i.e., 65399569 + 692224 = 8087^2 + 832^2 .

It is a cyclic number.

It is not a de Polignac number, because 66091793 - 2⁴ = 66091777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66091793.

It is not a weakly prime, because it can be changed into another prime (66091799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33045896 + 33045897.

It is an arithmetic number, because the mean of its divisors is an integer number (33045897).

Almost surely, 2^66091793 is an apocalyptic number.

It is an amenable number.

66091793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66091793 is an equidigital number, since it uses as much as digits as its factorization.

66091793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 66091793 is about 8129.6859102920. The cubic root of 66091793 is about 404.3112675681.

The spelling of 66091793 in words is "sixty-six million, ninety-one thousand, seven hundred ninety-three".