66573361 has 2 divisors, whose sum is σ = 66573362. Its totient is φ = 66573360.

The previous prime is 66573313. The next prime is 66573373. The reversal of 66573361 is 16337566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45697600 + 20875761 = 6760^2 + 4569^2 .

It is a cyclic number.

It is not a de Polignac number, because 66573361 - 2⁷ = 66573233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66573361.

It is not a weakly prime, because it can be changed into another prime (66573301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286680 + 33286681.

It is an arithmetic number, because the mean of its divisors is an integer number (33286681).

Almost surely, 2^66573361 is an apocalyptic number.

It is an amenable number.

66573361 is a deficient number, since it is larger than the sum of its proper divisors (1).

66573361 is an equidigital number, since it uses as much as digits as its factorization.

66573361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 37.

The square root of 66573361 is about 8159.2500268101. The cubic root of 66573361 is about 405.2908767467.

The spelling of 66573361 in words is "sixty-six million, five hundred seventy-three thousand, three hundred sixty-one".