66736706025481 has 2 divisors, whose sum is σ = 66736706025482. Its totient is φ = 66736706025480.

The previous prime is 66736706025467. The next prime is 66736706025491. The reversal of 66736706025481 is 18452060763766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65989546326025 + 747159699456 = 8123395^2 + 864384^2 .

It is a cyclic number.

It is not a de Polignac number, because 66736706025481 - 2⁹ = 66736706024969 is a prime.

It is a super-2 number, since 2×66736706025481² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66736706025421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368353012740 + 33368353012741.

It is an arithmetic number, because the mean of its divisors is an integer number (33368353012741).

Almost surely, 2^{66736706025481} is an apocalyptic number.

It is an amenable number.

66736706025481 is a deficient number, since it is larger than the sum of its proper divisors (1).

66736706025481 is an equidigital number, since it uses as much as digits as its factorization.

66736706025481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 66736706025481 in words is "sixty-six trillion, seven hundred thirty-six billion, seven hundred six million, twenty-five thousand, four hundred eighty-one".