66411091 has 2 divisors, whose sum is σ = 66411092. Its totient is φ = 66411090.

The previous prime is 66411089. The next prime is 66411109. The reversal of 66411091 is 19011466.

Together with next prime (66411109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66411091 - 2¹ = 66411089 is a prime.

Together with 66411089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66411011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33205545 + 33205546.

It is an arithmetic number, because the mean of its divisors is an integer number (33205546).

Almost surely, 2^66411091 is an apocalyptic number.

66411091 is a deficient number, since it is larger than the sum of its proper divisors (1).

66411091 is an equidigital number, since it uses as much as digits as its factorization.

66411091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 66411091 is about 8149.3000312910. The cubic root of 66411091 is about 404.9613152097.

The spelling of 66411091 in words is "sixty-six million, four hundred eleven thousand, ninety-one".