66744427 has 2 divisors, whose sum is σ = 66744428. Its totient is φ = 66744426.

The previous prime is 66744407. The next prime is 66744443. The reversal of 66744427 is 72444766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66744427 - 2²³ = 58355819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66744427.

It is not a weakly prime, because it can be changed into another prime (66744407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33372213 + 33372214.

It is an arithmetic number, because the mean of its divisors is an integer number (33372214).

Almost surely, 2^66744427 is an apocalyptic number.

66744427 is a deficient number, since it is larger than the sum of its proper divisors (1).

66744427 is an equidigital number, since it uses as much as digits as its factorization.

66744427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 40.

The square root of 66744427 is about 8169.7262500037. The cubic root of 66744427 is about 405.6377231343.

The spelling of 66744427 in words is "sixty-six million, seven hundred forty-four thousand, four hundred twenty-seven".