66054200249 has 2 divisors, whose sum is σ = 66054200250. Its totient is φ = 66054200248.

The previous prime is 66054200237. The next prime is 66054200257. The reversal of 66054200249 is 94200245066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50875960249 + 15178240000 = 225557^2 + 123200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66054200249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66054200209) 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, 33027100124 + 33027100125.

It is an arithmetic number, because the mean of its divisors is an integer number (33027100125).

Almost surely, 2^66054200249 is an apocalyptic number.

It is an amenable number.

66054200249 is a deficient number, since it is larger than the sum of its proper divisors (1).

66054200249 is an equidigital number, since it uses as much as digits as its factorization.

66054200249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 66054200249 in words is "sixty-six billion, fifty-four million, two hundred thousand, two hundred forty-nine".