66573797 has 2 divisors, whose sum is σ = 66573798. Its totient is φ = 66573796.

The previous prime is 66573733. The next prime is 66573803. The reversal of 66573797 is 79737566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50324836 + 16248961 = 7094^2 + 4031^2 .

It is a cyclic number.

It is not a de Polignac number, because 66573797 - 2⁶ = 66573733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66573097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286898 + 33286899.

It is an arithmetic number, because the mean of its divisors is an integer number (33286899).

Almost surely, 2^66573797 is an apocalyptic number.

It is an amenable number.

66573797 is a deficient number, since it is larger than the sum of its proper divisors (1).

66573797 is an equidigital number, since it uses as much as digits as its factorization.

66573797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1666980, while the sum is 50.

The square root of 66573797 is about 8159.2767449082. The cubic root of 66573797 is about 405.2917615172.

The spelling of 66573797 in words is "sixty-six million, five hundred seventy-three thousand, seven hundred ninety-seven".