666754014181 has 2 divisors, whose sum is σ = 666754014182. Its totient is φ = 666754014180.

The previous prime is 666754014167. The next prime is 666754014233. The reversal of 666754014181 is 181410457666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477847300225 + 188906713956 = 691265^2 + 434634^2 .

It is a cyclic number.

It is not a de Polignac number, because 666754014181 - 2¹⁹ = 666753489893 is a prime.

It is a super-2 number, since 2×666754014181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666754014151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333377007090 + 333377007091.

It is an arithmetic number, because the mean of its divisors is an integer number (333377007091).

Almost surely, 2^666754014181 is an apocalyptic number.

It is an amenable number.

666754014181 is a deficient number, since it is larger than the sum of its proper divisors (1).

666754014181 is an equidigital number, since it uses as much as digits as its factorization.

666754014181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 666754014181 in words is "six hundred sixty-six billion, seven hundred fifty-four million, fourteen thousand, one hundred eighty-one".