667544867117 has 2 divisors, whose sum is σ = 667544867118. Its totient is φ = 667544867116.

The previous prime is 667544867083. The next prime is 667544867147. The reversal of 667544867117 is 711768445766.

667544867117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491609920201 + 175934946916 = 701149^2 + 419446^2 .

It is a cyclic number.

It is not a de Polignac number, because 667544867117 - 2¹⁸ = 667544604973 is a prime.

It is a super-2 number, since 2×667544867117² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667544867117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667544867147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333772433558 + 333772433559.

It is an arithmetic number, because the mean of its divisors is an integer number (333772433559).

Almost surely, 2^667544867117 is an apocalyptic number.

It is an amenable number.

667544867117 is a deficient number, since it is larger than the sum of its proper divisors (1).

667544867117 is an equidigital number, since it uses as much as digits as its factorization.

667544867117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47416320, while the sum is 62.

The spelling of 667544867117 in words is "six hundred sixty-seven billion, five hundred forty-four million, eight hundred sixty-seven thousand, one hundred seventeen".