667781012243 has 2 divisors, whose sum is σ = 667781012244. Its totient is φ = 667781012242.

The previous prime is 667781012237. The next prime is 667781012251. The reversal of 667781012243 is 342210187766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667781012243 - 2¹⁴ = 667780995859 is a prime.

It is not a weakly prime, because it can be changed into another prime (667781015243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333890506121 + 333890506122.

It is an arithmetic number, because the mean of its divisors is an integer number (333890506122).

Almost surely, 2^667781012243 is an apocalyptic number.

667781012243 is a deficient number, since it is larger than the sum of its proper divisors (1).

667781012243 is an equidigital number, since it uses as much as digits as its factorization.

667781012243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 667781012243 in words is "six hundred sixty-seven billion, seven hundred eighty-one million, twelve thousand, two hundred forty-three".