66544333157 has 2 divisors, whose sum is σ = 66544333158. Its totient is φ = 66544333156.

The previous prime is 66544333151. The next prime is 66544333181. The reversal of 66544333157 is 75133344566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63126060001 + 3418273156 = 251249^2 + 58466^2 .

It is a cyclic number.

It is not a de Polignac number, because 66544333157 - 2¹⁰ = 66544332133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66544333151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33272166578 + 33272166579.

It is an arithmetic number, because the mean of its divisors is an integer number (33272166579).

Almost surely, 2^66544333157 is an apocalyptic number.

It is an amenable number.

66544333157 is a deficient number, since it is larger than the sum of its proper divisors (1).

66544333157 is an equidigital number, since it uses as much as digits as its factorization.

66544333157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 47.

The spelling of 66544333157 in words is "sixty-six billion, five hundred forty-four million, three hundred thirty-three thousand, one hundred fifty-seven".