66341557 has 2 divisors, whose sum is σ = 66341558. Its totient is φ = 66341556.

The previous prime is 66341549. The next prime is 66341573. The reversal of 66341557 is 75514366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48986001 + 17355556 = 6999^2 + 4166^2 .

It is a cyclic number.

It is not a de Polignac number, because 66341557 - 2³ = 66341549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66341507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33170778 + 33170779.

It is an arithmetic number, because the mean of its divisors is an integer number (33170779).

Almost surely, 2^66341557 is an apocalyptic number.

It is an amenable number.

66341557 is a deficient number, since it is larger than the sum of its proper divisors (1).

66341557 is an equidigital number, since it uses as much as digits as its factorization.

66341557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 37.

The square root of 66341557 is about 8145.0326580070. The cubic root of 66341557 is about 404.8199311278.

The spelling of 66341557 in words is "sixty-six million, three hundred forty-one thousand, five hundred fifty-seven".