1667680117 has 2 divisors, whose sum is σ = 1667680118. Its totient is φ = 1667680116.

The previous prime is 1667680087. The next prime is 1667680121. The reversal of 1667680117 is 7110867661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1162059921 + 505620196 = 34089^2 + 22486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667680117 - 2¹⁹ = 1667155829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1667680187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833840058 + 833840059.

It is an arithmetic number, because the mean of its divisors is an integer number (833840059).

Almost surely, 2^1667680117 is an apocalyptic number.

It is an amenable number.

1667680117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667680117 is an equidigital number, since it uses as much as digits as its factorization.

1667680117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 1667680117 is about 40837.2393410720. The cubic root of 1667680117 is about 1185.8713684505.

The spelling of 1667680117 in words is "one billion, six hundred sixty-seven million, six hundred eighty thousand, one hundred seventeen".