66473489 has 2 divisors, whose sum is σ = 66473490. Its totient is φ = 66473488.

The previous prime is 66473443. The next prime is 66473503. The reversal of 66473489 is 98437466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39589264 + 26884225 = 6292^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 66473489 - 2⁸ = 66473233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66473389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33236744 + 33236745.

It is an arithmetic number, because the mean of its divisors is an integer number (33236745).

Almost surely, 2^66473489 is an apocalyptic number.

It is an amenable number.

66473489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66473489 is an equidigital number, since it uses as much as digits as its factorization.

66473489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 66473489 is about 8153.1275594093. The cubic root of 66473489 is about 405.0881056094.

The spelling of 66473489 in words is "sixty-six million, four hundred seventy-three thousand, four hundred eighty-nine".