66881334901 has 2 divisors, whose sum is σ = 66881334902. Its totient is φ = 66881334900.

The previous prime is 66881334859. The next prime is 66881334953. The reversal of 66881334901 is 10943318866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66757123876 + 124211025 = 258374^2 + 11145^2 .

It is a cyclic number.

It is not a de Polignac number, because 66881334901 - 2³¹ = 64733851253 is a prime.

It is a super-2 number, since 2×66881334901² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66881334701) 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, 33440667450 + 33440667451.

It is an arithmetic number, because the mean of its divisors is an integer number (33440667451).

Almost surely, 2^66881334901 is an apocalyptic number.

It is an amenable number.

66881334901 is a deficient number, since it is larger than the sum of its proper divisors (1).

66881334901 is an equidigital number, since it uses as much as digits as its factorization.

66881334901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 66881334901 in words is "sixty-six billion, eight hundred eighty-one million, three hundred thirty-four thousand, nine hundred one".