66473389 has 2 divisors, whose sum is σ = 66473390. Its totient is φ = 66473388.

The previous prime is 66473387. The next prime is 66473413. The reversal of 66473389 is 98337466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46376100 + 20097289 = 6810^2 + 4483^2 .

It is a cyclic number.

It is not a de Polignac number, because 66473389 - 2¹ = 66473387 is a prime.

It is a super-2 number, since 2×66473389² = 8837422890290642, which contains 22 as substring.

Together with 66473387, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66473387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33236694 + 33236695.

It is an arithmetic number, because the mean of its divisors is an integer number (33236695).

Almost surely, 2^66473389 is an apocalyptic number.

It is an amenable number.

66473389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66473389 is an equidigital number, since it uses as much as digits as its factorization.

66473389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 46.

The square root of 66473389 is about 8153.1214267911. The cubic root of 66473389 is about 405.0879024767.

The spelling of 66473389 in words is "sixty-six million, four hundred seventy-three thousand, three hundred eighty-nine".