667233084781 has 2 divisors, whose sum is σ = 667233084782. Its totient is φ = 667233084780.

The previous prime is 667233084767. The next prime is 667233084851. The reversal of 667233084781 is 187480332766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624272231881 + 42960852900 = 790109^2 + 207270^2 .

It is a cyclic number.

It is not a de Polignac number, because 667233084781 - 2¹⁹ = 667232560493 is a prime.

It is a super-2 number, since 2×667233084781² (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 (667233084701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333616542390 + 333616542391.

It is an arithmetic number, because the mean of its divisors is an integer number (333616542391).

Almost surely, 2^667233084781 is an apocalyptic number.

It is an amenable number.

667233084781 is a deficient number, since it is larger than the sum of its proper divisors (1).

667233084781 is an equidigital number, since it uses as much as digits as its factorization.

667233084781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 667233084781 in words is "six hundred sixty-seven billion, two hundred thirty-three million, eighty-four thousand, seven hundred eighty-one".