667139709469 has 2 divisors, whose sum is σ = 667139709470. Its totient is φ = 667139709468.

The previous prime is 667139709433. The next prime is 667139709473. The reversal of 667139709469 is 964907931766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519245624569 + 147894084900 = 720587^2 + 384570^2 .

It is a cyclic number.

It is not a de Polignac number, because 667139709469 - 2¹⁷ = 667139578397 is a prime.

It is a super-2 number, since 2×667139709469² (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 (667139709419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333569854734 + 333569854735.

It is an arithmetic number, because the mean of its divisors is an integer number (333569854735).

Almost surely, 2^667139709469 is an apocalyptic number.

It is an amenable number.

667139709469 is a deficient number, since it is larger than the sum of its proper divisors (1).

667139709469 is an equidigital number, since it uses as much as digits as its factorization.

667139709469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92588832, while the sum is 67.

The spelling of 667139709469 in words is "six hundred sixty-seven billion, one hundred thirty-nine million, seven hundred nine thousand, four hundred sixty-nine".