667740336420511 has 2 divisors, whose sum is σ = 667740336420512. Its totient is φ = 667740336420510.

The previous prime is 667740336420413. The next prime is 667740336420557. The reversal of 667740336420511 is 115024633047766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667740336420511 - 2¹⁹ = 667740335896223 is a prime.

It is a super-2 number, since 2×667740336420511² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667740336420571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333870168210255 + 333870168210256.

It is an arithmetic number, because the mean of its divisors is an integer number (333870168210256).

Almost surely, 2^{667740336420511} is an apocalyptic number.

667740336420511 is a deficient number, since it is larger than the sum of its proper divisors (1).

667740336420511 is an equidigital number, since it uses as much as digits as its factorization.

667740336420511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 55.

The spelling of 667740336420511 in words is "six hundred sixty-seven trillion, seven hundred forty billion, three hundred thirty-six million, four hundred twenty thousand, five hundred eleven".