66713447 has 2 divisors, whose sum is σ = 66713448. Its totient is φ = 66713446.

The previous prime is 66713431. The next prime is 66713473. The reversal of 66713447 is 74431766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66713447 - 2⁴ = 66713431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66713447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66713407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33356723 + 33356724.

It is an arithmetic number, because the mean of its divisors is an integer number (33356724).

Almost surely, 2^66713447 is an apocalyptic number.

66713447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66713447 is an equidigital number, since it uses as much as digits as its factorization.

66713447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 38.

The square root of 66713447 is about 8167.8300055768. The cubic root of 66713447 is about 405.5749533420.

The spelling of 66713447 in words is "sixty-six million, seven hundred thirteen thousand, four hundred forty-seven".