66775123 has 2 divisors, whose sum is σ = 66775124. Its totient is φ = 66775122.

The previous prime is 66775103. The next prime is 66775153. The reversal of 66775123 is 32157766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66775123 is a prime.

It is not a weakly prime, because it can be changed into another prime (66775103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387561 + 33387562.

It is an arithmetic number, because the mean of its divisors is an integer number (33387562).

Almost surely, 2^66775123 is an apocalyptic number.

66775123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66775123 is an equidigital number, since it uses as much as digits as its factorization.

66775123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The square root of 66775123 is about 8171.6046771733. The cubic root of 66775123 is about 405.6998983489.

The spelling of 66775123 in words is "sixty-six million, seven hundred seventy-five thousand, one hundred twenty-three".