66775073 has 2 divisors, whose sum is σ = 66775074. Its totient is φ = 66775072.

The previous prime is 66775067. The next prime is 66775103. The reversal of 66775073 is 37057766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61653904 + 5121169 = 7852^2 + 2263^2 .

It is a cyclic number.

It is not a de Polignac number, because 66775073 - 2⁴ = 66775057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66775073.

It is not a weakly prime, because it can be changed into another prime (66775013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387536 + 33387537.

It is an arithmetic number, because the mean of its divisors is an integer number (33387537).

Almost surely, 2^66775073 is an apocalyptic number.

It is an amenable number.

66775073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66775073 is an equidigital number, since it uses as much as digits as its factorization.

66775073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 41.

The square root of 66775073 is about 8171.6016177981. The cubic root of 66775073 is about 405.6997970887.

The spelling of 66775073 in words is "sixty-six million, seven hundred seventy-five thousand, seventy-three".