66541702757 has 2 divisors, whose sum is σ = 66541702758. Its totient is φ = 66541702756.

The previous prime is 66541702729. The next prime is 66541702769. The reversal of 66541702757 is 75720714566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53672842276 + 12868860481 = 231674^2 + 113441^2 .

It is a cyclic number.

It is not a de Polignac number, because 66541702757 - 2⁶ = 66541702693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66541702727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33270851378 + 33270851379.

It is an arithmetic number, because the mean of its divisors is an integer number (33270851379).

Almost surely, 2^66541702757 is an apocalyptic number.

It is an amenable number.

66541702757 is a deficient number, since it is larger than the sum of its proper divisors (1).

66541702757 is an equidigital number, since it uses as much as digits as its factorization.

66541702757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2469600, while the sum is 50.

The spelling of 66541702757 in words is "sixty-six billion, five hundred forty-one million, seven hundred two thousand, seven hundred fifty-seven".