66745771 has 2 divisors, whose sum is σ = 66745772. Its totient is φ = 66745770.

The previous prime is 66745753. The next prime is 66745799. The reversal of 66745771 is 17754766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66745771 - 2¹⁷ = 66614699 is a prime.

It is not a weakly prime, because it can be changed into another prime (66745711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33372885 + 33372886.

It is an arithmetic number, because the mean of its divisors is an integer number (33372886).

Almost surely, 2^66745771 is an apocalyptic number.

66745771 is a deficient number, since it is larger than the sum of its proper divisors (1).

66745771 is an equidigital number, since it uses as much as digits as its factorization.

66745771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 43.

The square root of 66745771 is about 8169.8085044877. The cubic root of 66745771 is about 405.6404458258.

The spelling of 66745771 in words is "sixty-six million, seven hundred forty-five thousand, seven hundred seventy-one".