66811093 has 2 divisors, whose sum is σ = 66811094. Its totient is φ = 66811092.

The previous prime is 66811091. The next prime is 66811097. The reversal of 66811093 is 39011866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49028004 + 17783089 = 7002^2 + 4217^2 .

It is a cyclic number.

It is not a de Polignac number, because 66811093 - 2¹ = 66811091 is a prime.

Together with 66811091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66811091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33405546 + 33405547.

It is an arithmetic number, because the mean of its divisors is an integer number (33405547).

Almost surely, 2^66811093 is an apocalyptic number.

It is an amenable number.

66811093 is a deficient number, since it is larger than the sum of its proper divisors (1).

66811093 is an equidigital number, since it uses as much as digits as its factorization.

66811093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 66811093 is about 8173.8052949651. The cubic root of 66811093 is about 405.7727318892.

The spelling of 66811093 in words is "sixty-six million, eight hundred eleven thousand, ninety-three".