66610123 has 2 divisors, whose sum is σ = 66610124. Its totient is φ = 66610122.

The previous prime is 66610111. The next prime is 66610147. The reversal of 66610123 is 32101666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66610123 - 2¹⁷ = 66479051 is a prime.

It is not a weakly prime, because it can be changed into another prime (66610163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33305061 + 33305062.

It is an arithmetic number, because the mean of its divisors is an integer number (33305062).

Almost surely, 2^66610123 is an apocalyptic number.

66610123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66610123 is an equidigital number, since it uses as much as digits as its factorization.

66610123 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 25.

The square root of 66610123 is about 8161.5024964770. The cubic root of 66610123 is about 405.3654639456.

Adding to 66610123 its reverse (32101666), we get a palindrome (98711789).

The spelling of 66610123 in words is "sixty-six million, six hundred ten thousand, one hundred twenty-three".