66733943377877 has 2 divisors, whose sum is σ = 66733943377878. Its totient is φ = 66733943377876.

The previous prime is 66733943377817. The next prime is 66733943377951. The reversal of 66733943377877 is 77877334933766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65085508218481 + 1648435159396 = 8067559^2 + 1283914^2 .

It is a cyclic number.

It is not a de Polignac number, because 66733943377877 - 2¹⁴ = 66733943361493 is a prime.

It is a super-4 number, since 4×66733943377877⁴ (a number of 56 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66733943377817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366971688938 + 33366971688939.

It is an arithmetic number, because the mean of its divisors is an integer number (33366971688939).

Almost surely, 2^{66733943377877} is an apocalyptic number.

It is an amenable number.

66733943377877 is a deficient number, since it is larger than the sum of its proper divisors (1).

66733943377877 is an equidigital number, since it uses as much as digits as its factorization.

66733943377877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14114653056, while the sum is 80.

The spelling of 66733943377877 in words is "sixty-six trillion, seven hundred thirty-three billion, nine hundred forty-three million, three hundred seventy-seven thousand, eight hundred seventy-seven".