66545357 has 2 divisors, whose sum is σ = 66545358. Its totient is φ = 66545356.

The previous prime is 66545341. The next prime is 66545363. The reversal of 66545357 is 75354566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64416676 + 2128681 = 8026^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 66545357 - 2⁴ = 66545341 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 (66545377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33272678 + 33272679.

It is an arithmetic number, because the mean of its divisors is an integer number (33272679).

Almost surely, 2^66545357 is an apocalyptic number.

It is an amenable number.

66545357 is a deficient number, since it is larger than the sum of its proper divisors (1).

66545357 is an equidigital number, since it uses as much as digits as its factorization.

66545357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 41.

The square root of 66545357 is about 8157.5337572087. The cubic root of 66545357 is about 405.2340404118.

The spelling of 66545357 in words is "sixty-six million, five hundred forty-five thousand, three hundred fifty-seven".