66355057 has 2 divisors, whose sum is σ = 66355058. Its totient is φ = 66355056.

The previous prime is 66355043. The next prime is 66355123. The reversal of 66355057 is 75055366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48385936 + 17969121 = 6956^2 + 4239^2 .

It is a cyclic number.

It is not a de Polignac number, because 66355057 - 2¹¹ = 66353009 is a prime.

It is not a weakly prime, because it can be changed into another prime (66355027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33177528 + 33177529.

It is an arithmetic number, because the mean of its divisors is an integer number (33177529).

Almost surely, 2^66355057 is an apocalyptic number.

It is an amenable number.

66355057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66355057 is an equidigital number, since it uses as much as digits as its factorization.

66355057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94500, while the sum is 37.

The square root of 66355057 is about 8145.8613418103. The cubic root of 66355057 is about 404.8473885198.

The spelling of 66355057 in words is "sixty-six million, three hundred fifty-five thousand, fifty-seven".